I was experiencing the same issue with OneDrive Personal repeatedly pausing sync for no apparent reason. Work OneDrive on the same PC was unaffected.
What I observed:
OneDrive Personal would begin processing changes normally, then suddenly pause.
Resuming sync caused it to start processing again, but it would eventually pause again.
Metered Connection pause was disabled.
Resetting OneDrive did not resolve the issue.
Closing Google Chrome consistently stopped the pausing.
Chrome was not signed into the same Microsoft account as OneDrive.
I then noticed that Windows Game Bar/Game Mode had Google Chrome set as the application associated with game capture. Chrome was not actively being recorded, but it was the application Game Bar was prepared to capture.
I changed the capture target away from Chrome and also disabled Windows Game Mode.
Since making those changes, OneDrive Personal has remained syncing normally, including with Chrome open. It remained stable overnight.
This may not apply to everyone, but if OneDrive Personal pauses whenever Chrome is running, it may be worth checking:
Settings → Gaming → Game Mode
and Xbox Game Bar/capture settings to see whether Chrome or another browser is being treated as a game/capture application.
This appears to have resolved the issue for me.