This is an indication of a short in the cable and it needs to be replaced. If you shake the hammer cable and it triggers, it is that cable. If it is the accelerometer cable that triggers then replace that cabkle. You can run a test to be sure: https://mli.supportbee.io/2770-speedcast-support-center/5986-troubleshooting/18833-testing-your-kit-s-hardware-cables
Order from PCB.com:
10' Hammer Cable with BNC Connectors (003D10)
10' Accelerometer Cable 3-56 to BNC (030C10)