Another odd AXI question

[Mod Man]

Hey Guys!

This is another question about my AXI 5345 in my E-bike.

I have been pulling over 4000 watts from it in the bike and I have heard a disturbing sound a couple times. I am wondering if it is possibly the motor shaft slipping in its press fit junction at the end of the motor can.

So, AXI experts, any thoughts?

The shaft presses through a steel rear plate. If that is the problem, I can MIG weld the shaft to that plate (simple enough) like welding a press fit crankshaft.

Thoughts?

Matt