First, search the help docs and this forum. Maybe your question has been answered! The debugging steps can help, too. Still stuck? Delete this line and proceed.
Obsidian suddenly switches automatically back to reading mode after a few seconds
I checked all the many plugins I’ve installed, but non seemed to be the culprit. At least according to their descriptions.
It wasn’t like this before the last update of Obsidian and some of the plugins.
Please report what you get from Show debug info.
With that many plugins it’s not unlikely that one (or some of them) are interfering with the display somehow. The best option if this is the case is to use the Divide and conquer plugin to potentially locate the culprit.
So best way forward I’d say would be to copy your vault to a different location, and start playing around with the plugin above, and/or turning off all plugins to see if the issue goes away then. This way you’ve got a “safe” playground since you’re playing around with a copy of your vault.
The debug info:
SYSTEM INFO:
Obsidian version: v1.8.9
Installer version: v1.8.4
Operating system: Windows 10 Pro 10.0.19045
Login status: logged in
Language: en
Catalyst license: none
Insider build toggle: off
Live preview: off
Base theme: adapt to system
Community theme: Elegance v0.1.1
Snippets enabled: 0
Restricted mode: off
Plugins installed: 120
Plugins enabled: 106
1: File Tree Alternative v2.6.0
2: ABC Music Notation v1.5.0
3: Admonition v10.3.2
4: Advanced Cursors v0.5.1
5: Advanced Tables v0.22.1
6: Advanced URI v1.44.3
7: Annotator v0.2.11
8: Auto Link Title v1.5.5
9: Better CodeBlock v1.0.8
10: Better MathJax v1.0.1
11: Better Search Views v0.3.0
12: Better Word Count v0.10.1
13: Budget WYSIWYG v1.0.5
14: Buttons v0.5.1
15: Calendar v1.5.10
16: Calibre v1.0.8
17: Canvas Mindmap v1.0.2
18: CardBoard v0.7.9
19: Charts v3.9.0
20: ChatGPT MD v2.1.2
21: Checklist v2.2.14
22: Citations v0.4.5
23: Clipper v0.2.9
24: Code block from selection v1.0.7
25: Colored Tags v5.0.1
26: Colored Text v1.2.0
27: Comments v0.2.0
28: Contextual Typography v2.2.5
29: Convert url to preview (iframe) v0.5.0
30: Creases v0.7.0
31: CSV Table v1.2.0
32: Daily Note Outline v1.5.0
33: DataLoom v8.16.1
34: Dataview v0.5.68
35: Day Planner v0.27.0
36: DeepL v1.0.7
37: Dictionary v2.22.0
38: Drag-n-Drop for blocks v1.2.0
39: Duplicate Line v3.1.2
40: Dynamic Highlights v0.3.1
41: Dynamic Timetable v4.6.1
42: Editing Toolbar v3.1.13
43: Editor Syntax Highlight v0.1.3
44: Embedded Code Title v0.5.5
45: Emoji Shortcodes v2.2.0
46: Emoji Toolbar v0.4.1
47: Enhancing Export v1.10.9
48: Enhancing Mindmap v0.2.5
49: Excalidraw v2.9.2
50: Excel to Markdown Table v0.4.0
51: File Color v1.1.0
52: Find orphaned files and broken links v1.10.1
53: Folder Note v0.7.3
54: Footnote Shortcut v0.1.3
55: Full Calendar v0.10.7
56: Gallery v0.5.8
57: Highlightr v1.2.2
58: Hotkey Helper v0.3.20
59: HTML Tags Autocomplete v0.0.7
60: Icons v0.3.0
61: Image Layouts v0.15.5
62: Image Toolkit v1.4.2
63: Kanban v2.0.51
64: Keyboard Analyzer v0.1.3
65: Kindle Highlights v1.9.2
66: LanguageTool Integration v0.3.7
67: Markdown Formatting Assistant v0.4.1
68: Markmind v3.1.2
69: Media DB v0.8.0
70: Meeting notes v1.0.6
71: Meld Encrypt v2.4.0
72: Min Width v1.0.4
73: Mindmap NextGen v1.13.2
74: Mousewheel Image zoom v1.0.22
75: Multi-Column Markdown v0.9.1
76: MySnippets v1.2.3
77: Nested tags graph v1.0.2
78: Note Refactor v1.8.2
79: Numerals v1.5.0
80: Obsidian Stylist v0.0.4
81: Omnisearch v1.26.1
82: Open Link With v0.1.10
83: Ordered List Style v0.1.0
84: Outliner v4.9.0
85: Pandoc Plugin v0.4.1
86: Pane Relief v0.5.9
87: Paste URL into selection v1.7.0
88: PDF++ v0.40.28
89: Projects v1.17.4
90: Quiet Outline v0.3.42
91: ReadItLater v0.11.4
92: Remember cursor position v1.0.9
93: Reminder v1.1.19
94: Simple Embeds v1.14.1
95: Sortable v0.3.1
96: Style Settings v1.0.9
97: Table Extended v1.6.1
98: Table of Contents v0.2.0
99: Tag Wrangler v0.6.4
100: TagFolder v0.18.10
101: Tags Overview v1.0.4
102: Tasks v7.18.4
103: Text Extractor v0.5.2
104: Version History Diff v2.2.1
105: Wikipedia v1.0.3
106: Zoom v1.1.2
RECOMMENDATIONS:
Custom theme and snippets: for cosmetic issues, please first try updating your theme and disabling your snippets. If still not fixed, please try to make the issue happen in the Sandbox Vault or disable community theme and snippets.
Community plugins: for bugs, please first try updating all your plugins to latest. If still not fixed, please try to make the issue happen in the Sandbox Vault or disable community plugins.
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But I guess I’ve to deactivate all plugins and activate it one-by-one or check after each one I deactivated.
Try the Divide and conquer plugin. It allows you to enable/disable groups of plugin, which when done correctly will have you identify the culprit in no more than 7-8 rounds of disabling and enabling.
You’ll disable half of the plugins which are enabled for each round, and if the problem remains, you keep splitting the enabled plugins, and if the problem disappear you re-enable that last split, and keep working with the other half of the plugins. In no time, you should locate the culprit.
Mea culpa
Sorry, when I checked my plugins, I searched my installed plugins by using Browse in the settings dialog of Community Plugins for Budget WYSIWYG but didn’t see it.
Just now I did the same for testing and it showed no result.
But yesterday, when I disabled the installed plugins one by one, I suddenly came to exactly that one. The Budget WYSIWYG plugin. I was searching for it because in this forum I found a thread where somebody had the same problem, and it showed that this plugin was the culprit.
Therefore, I disabled said plugin and now it works fine again.
I would really like to know why this plugin is in the list of Community Plugins in the settings but is not shown when the Browse button is used to open the plugins dialog. There, I selected to show only installed plugins and entered “Budget” into the search field. It showed no results. Then I selected to show all plugins and got the same result.
It seems that this plugin is no longer available, but there was never any warning about it being obsolete or outdated.
Perhaps there should be an internal check in Obsidian for plugins that are no longer available or compatible with the installed version of Obsidian?
I reckon this one of the reason why using the Show debug info is very useful. I’ve also seen some plugins not appearing in the Settings section since they don’t have that, and those also are kind of invisible in some of the other views.
So do use the Show debug info when in doubt. 
Here is a feature request to inform users when plugins have been removed — it would be great if you could add your experience in a comment there (and include a link to this thread):
I just wrote there to support this request.
