Bamboo Bustin - Drive mode 2 dropouts :(

Hey Mates!

I bought a used bamboo bustin. I noticed that there are dropouts in drive mode 2, in drive mode 1 everything is working great. After a few moments in Mode 2 the board simply continues to run without accepting further acceleration while the trigger is pulled. The motor just stops fully and just reacts after a few seconds or if i push the trigger once (brake) and then pull it again to accelerate. It also happens regardless of slope or gradient and how much i have pulled the trigger. I have tried a second remote but with the same resault and also removed the battery to check lose connections. Now and then everything works normally for just a few meters.

Has anyone had the same experience or any idea what the problem could be and does the inside look "normal"?