The SHT30 just stopped working on me. This is on the Pro kit, resisters removed. I have both the SHT30 and TVOC sensors installed, but never got reliable readings on the TVOC. Then in the middle of the night, the SHT30 started reporting 0s. It had worked for weeks without issue.
I had the same issue twice. I did some rather extreme modification to the board and removed the 5v trace that is going to the sht and soldered a wire to the 3,3v power. In my experience this with the removed resistors works more reliable
I did the same 3.3v trick but still have troubles getting to work reliably. SGP(TVOC) most of the time work and if it does it hangs the bus after a while. Still troubleshooting.