Yes , also encounterd the same in my app with SAMBA.
For weeks it worked just great and then at some point output of the PID went 100% ad only autotune get rid off it.
I did not check the PID status since I was not on site ,but costumer lost confidence in unitronics SAMBA.
It is strange because it worked perfect for some time. Instalation is on wery remote site and I can not get all information in time (hidroelectric power generator).
If windup would occour , should i get this symptome?