OK, just received a email from Michelle from Hifei and they have fixed both ESC. Apparently both esc had a resistor which became oxidized and that was causing the problems.
I will let you guys know how they preform when I get them back.
A big thanks to hifei for the quick response, but the real test will be when I get them back into my boat.
I have some plastic dip here at home, do you think when I get my esc back I should give them a dip and waterproof them?