No errors on my device that I noticed. Can't tell you if it works on other networks cause I only use it at home where my cell signal is almost dead. I rely on WiFi calling to use my service at home. I called T-Mobile about my reception issues many times in the past years, but nothing is ever fixed.
Definitely I think something is turning off the Wi-Fi app or some errors in the last update we got. Needs to looked at.