Im based in HK and after my conversation with the technical staff in Canon HK, they've informed me that its likely a hardware issue and for me to send it back in for repair.
In my case, the Err 80 never stopped popping up despite using a 24mm f/1.4 II, 35mm f/1.4, 50mm f/1.2 or 85mm f/1.2 II.... even without a lens, the issue came up. HOWEVER, it started while using the 85mm f/1.2 II
Kinda disappointing given that I've only had it for 4 weeks.
anyone else had to send it in for repair?