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Thanks for your report, that was helpful.
I'll implement automated resubscriptions, but I don't know if it will fix such problems in the future, because it can be browser's/system's fault - if they decide to wipe cache for some reason, there's nothing I can do. Did you ever had problems like that on that device - you are suddenly logged out of some accounts, your settings on sites are gone, etc.?
If you'll encounter same problem again, go to the site and see if there's any subscriptions displayed - if not, it means your subscription has expired and you have to subscribe again, otherwise it might be a problem on my side.
Got it, i had cleared browser cache few days ago, that could be the reason.
Edit: cache on android is usually safe to delete so I don't give second thought.
Update: I cleared browser cache again and subscription is intact, so last time clearing cache was not the cause of the problem.