Poly Edge E550 (maybe others) problems with 8.4.1.0068 Firmware

We’ve had a few users that had phones hanging off small 5 port DLINK POE powered pass-through switches. The users Poly Edge E550 phones lines were going red and the phone would reboot or cycle but come back. It would happen intermittently. We figured these low power POE powered passthrough switches were to blame so we remove them and the problem still occurred. We rolled the users phones back to 8.3.1 firmware and we haven’t had any reports. So far only two users phones reported issues but they are two users that probably talk more than others and so they noticed we think. Our of an abundance of caution we rolled all phones back to 8.3.1 and are waiting for a new firmware. Anyone had similar issues with Poly Edge 8.4.1.0068 firmware?