@eiliscoleman while we have them we'll also put them through our latest calibration process, which includes a temperature characterization process. That process was not available back when we were shipping 2.0.x hardware.
The newer Wi-Fi hardware (and the software that goes with it) is more stable than the original, which is why I think it will solve the problem. Having the units here will also allow us to demonstrate that they can connect to our network and report data to OpenSensors over a sustained period of time before shipping them back to you.