GMT800 on star temp rear view mirror cold temp malfunction

Noticed my rear view mirror freaks out when cold. Works fine when warm. Any ideas what causes this? 2003 suburban z71

[@doctube2020]

Replaced mirror which also resolved several reoccurring codes:
U1096 lost communication with instrument cluster
U1016 Lost communication with Powertrain Control Module
U1000 Class 2 Data Link Malfunction
U1151 Loss of VIU communications Loss of onstar communication.
U1067 Lost communication with rear seat audio / rear HVAC
I guess when my old mirror would randomly power on and off it would trigger several of the above codes. It's been a week and I haven't seen any of these come back...