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I agree with @Dannydet, if this was a software issue, a hard reset should have fixed it. Since it did not, then that leads to assume that it is a hardware issue. You will need to get it fixed or replaced.yes, i already did both things, but persists.
not all threads have this option. this thread, for me, does not have that option.Try clicking on a thread. It should bring an option to follow if you aren't following or to unfollow if you are currently subscribed.