@squart Your phone is missing 6 months of GrapheneOS updates. It's likely the source of the issue. Please try this: Go to Settings > Apps > See all apps > tap the three dots upper-right corner > Show system > Find and tap on System Updater: enable it if it is disabled. Then select Storage & cache > tap on Clear cache, tap on Clear Storage.
Then go to Settings > System > System Updater and do a manual check for updates.
(If you had changed any settings in the System Updater they will have been reset now so you'll have to change them back).