2 AFCI Breakers Tripping - One instantly and the other after a few minutes
If a swap reveals that the symptoms stay, i.e. other AFCI are also tripping in the same circuits, and all devices/lamps etc. were disconnected, there is most likely one or more problems with the panels/boards or wires. 
Since the AFCI is tripping immediately, it seems to be a static fault and therefore an insulation tester would help to find the location via a bubble search, i.e. iteratively disconnecting half of the wires/outlets/circuits. Since an AFCI detects HF signals, a portable AM receiver may help searching when the insulation tester feeds that faulty location.
Possible reasons:


Water damage from heavy rain or moisture or plumbing, spilling/overfilling of bathtubes, sinks etc.
Rodents or insects having destroyed the insulation resulting in leakage currents
Any recent work like hammering nails or turning screws into the wall or ceiling
Earth movings/oscillations from earthquakes, underground activities, mining, construction activities, subways etc. causing stress to the building


If the AFCI are faulty, possible reasons are an overload, e.g. by a lightning strike or a shortcut or electric switching activities of the power supplier or any surges in the power lines. The main panel surge protection - if any - can not   cover 100% of all possible surge events. Maybe neighbours do have similar problems.