This is the moment when you have to collect data on the switch side.
"fast" and "slow" is about the exchange rate of BPDUs, so that's not important.
LACP mode either is "active" (FGT negotiating) or "passive" (awaiting negos). Allowed:
Static is (AFAIR) Cisco legacy mode bonding.
"Kernel panic: Aiee, killing interrupt handler!"