Regardless if CAN or USB the typical reasons are always the same. All reasons that we know are listed in Timer too close.
You also have lots of:
b'Got error -1 in can write: (105)No buffer space available'
Make sure, you have setup your CAN bus according to CANBUS - Klipper documentation and that you are using the same CAN speed everywhere. In addition check CANBUS Troubleshooting - Klipper documentation
Not sure that I understand this part correctly. Follow GitHub - bigtreetech/EBB and make sure to select the correct version of the board.
This has to work, or something else is amiss.