Having the same with 1600, though I should pass it again soon and stay there if I just take longer on my moves. Worse is tactics trainer, got over 1800 a while ago, now I hover 1600-1750.
So frustrating!
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Been trying to get my Online Chess rating to consistently be above 1700. Highest I got was 1712. I have moments where I beat a player that was rated 2010, then lose to someone that was rated 1500.
Not taking away from the 1500's that beat me, they played well...and I played poorly. But man, these past weeks to try and stay above 1700 have been tough!
Seems like I'll hit 1700, and then drop back to 1690's next game....grrrrr!!!! okay, done ranting. Just have to work harder!