This actually sounds like a failed 30 amp relay that is in the fuse box under the seat, near top of the engine, towards the front of the ski. You can get a 30 amp relay from an auto parts store, if the Seadoo dealer is too far away - apparently they are rather standard size and plug. They are about $10.
I have not had this loss of electrical power ever happen to me on my 2021 GTI 170, but I carry a spare relay based on the advice of my dealer.