Hello, seems like you are loosing connection with chips. A good sign is that it is still recognising whole chains and some chips, that means that it likely isn't a big problem like loose heatsinks.
I'd suggest you to download a custom firmware or at least update to latest one from Bitmain due to this:
1. Enhance the working stability of the miner under special conditions (e.g. a certain range of low or high ambient temperature environment).
I am assuming it's cold now in your country as it is in mine. If that is the case, they might not be easy to run in cold ambient temperatures. What I had to do to make my S17+ run is this:
My Z11 is heating up my S17+ hashboards which makes them run perfectly. As soon as I move my Z11 away from intake of S17+, it loses one or sometimes even two hashboards. I'd suggest you to try the same or at least heat up them before turning on.