engine cuts out in water

I’ve drove four wheelers my whole life, polaris, yamahas, and kawasakis. But this is odd for an efi. My problem doesn’t happen when water hits my exhaust but when i’m riding threw deeper water like up to the tail lights (yes my clutch box is snorkeled) my engine will start stalling unless I give it full throttle. So last night my friends and I were out wheeling and we came to a water hole. So I went first,i drove in and water came up to my rack, didn’t think much of this at the time because i’m used to deep water. so i started wheelying and my engine started to cut out and then I slipped off my rack where I was standing and let off the throttle and it died. I jumped back on turned the key off then on turned the key and gave it some gas, started up and i drove out. There was no water in air intake or clutch box. There was no water in the oil either!

I’m starting to think its the efi trying to accumulate for the cold engine???
I’m getting pretty pissed off at this bike, thinking I may have to become boring and get a sxs!!!

Please help!