Recently, I've been receiving a positioning error and the gimbal asking me to restart it. I also noticed that the roll motor (one facing the back of the Phone) is not completely smooth when moving it. I would describe the feeling of sand being in it.   If I move it enough while the osmo is off it seems to smooth up but I shouldn't have to do that.  I am past the return date as I purchased this humble the second week it came out. I've been operating the gimbal with a iPhone 7 with no case. Please advise.

It was working fine before, right? suddenly it shows the error, would you please upload a video showing the issue? thanks.