What you guys seeing for HW errors I'm, seeing about 60 and 70 on boards 1 and 3 after 24 hrs. Boards and 2 and 4 only have a few HW errors.
Mine has been running about 19 hours at an air conditioned data center. Chain 1 has 40 hardware errors, chain 2 has 1 error, and the rest have zero.
This seems to be a trend in recent Bitmain hardware. One of my S9's (the most recently purchased one) also has one board that gets 10x hardware errors of the other boards. I tried down clocking that unit to reduce the hardware errors.
Back on the L3+, I don't think that temperature is a factor. One of the hottest boards has zero hardware errors.