Heavy upgrade github json problem

Hello,
I have installed the heavy upgrade kit. I got the message ‘‘GitHub json error 3’’ problem.
So i download the heavy configuration ( brov2-heavy-3_5_2.params). Then: Vehicle setup-Parameter-tools-Load from file. Now truster # 7 and 8 working. but the rov2 works for a short time and warns me ‘‘motor command fail’’‘’ 10 min cool dow’’ ect.
My firmware revision is 3.5.4 and git revision 05fed49b. Am i missing Something with the heavy configuration since i load the file a got no other notification after?