Definitely the inverter as well. It's beeping and not producing until I clear the fault. The fault shows up on PowerView as well as MySolArk. This occurs on my neighbors inverter as well as mine. Yesterday both faulted at the same time. We both had a good run without arc faults, but lately there's been partial cloudy skies causing dramatic light changes. I believe the TIGOs adjusting to the changing clouds cause a current signature that the Sol-Ark interprets as an arc fault.
Without the notifications I may go hours without PV production.