Helix LT pedal sensor not working and tap delay circuit

[Glowal2]

Hi guys :)

 

I am a new purchaser of the Helix LT. I bought it from, a friend who had it since 2017.

 

Helix had never been updated and plugged into, a PC. I updated it to version 3.0.1 without any problems. I made the first presets and pedal was working. Suddenly it stopped working without any touch when it was connected to PC by USB.

 

I disassembled it, cleaned it and noticed that the sensor was not reading movement. I gently clean the sensor and I toutched couple times and after few tries it started to work. I put it back together and it worked fine. The sensor is not mechanically damaged (i think so) because moving and hitting Helix cover did not stop it from working.
 

After a few days I plugged the helix back to PC and after uploading patches pedal again stopped working after a while.... and suddenly I noticed that the tap switch is not responding to touch and the tempo was responding to strong pedal movement...

I recorded it on video. (It was like there was some kind of short circuit between these two?) 
https://drive.google.com/file/d/1RbVWOrTN1yIlT_TvqSEBvJStuFP7wFL1/view?usp=sharing
 

After a reboot and when there is no usb , tap switch works normally.... But wah doesn't work again like earlier and I have to unscrew the Helix again to get the sensor working again.

Is it a fault of bad usb cable which caused short circuit ? 
Or is it a sensor fault and the whole sensor board should be replaced? 

Maybe I need to clean all the wires and connections only?

My Helix is without warranty, so can I write to support and have them send me the sensor board to Europe or to service in my country?

Thank you in advance and best regards!
:)