Hi bro. I have already mentioned your problem which I encountered way before you. You might want to look at #63 of this thread.
Actually, doing a reset by pressing the hard button does not solve the issue as well, perhaps this is something that is software related and is pending for resolution..
Oh sorry i had missed your post, Well count me in for this bug. I have had 4 rt-ac87R. All of them do it after resets etc.
I hope it gets fixed.
Cheers