It looks like there is a problem with noise on one of the upstream channels which is why it has dropped to qam32. It may have even dropped to qam16 and you didn't notice it.
If your downstream power levels don't come down I would seriously be looking at a
6db fpa or asking the engineer to move my tap point if you end up with a visit.
Don't worry about the pre-rs errors, everyone gets them and you have literally got a handful of them which is nothing to worry about. It is the post-rs errors you have got to keep an eye on.