I have done a lot of chest mount detecting. The cable is a concern where it meets the control box if it is getting bent every time you bend over. Common if going straight down against belly and doing lots of bending over to dig. I’ll never forget a soldering job I had to do in the remote mountains of Alaska with a nail and pliers heated over a stove and just enough remnant solder to get the job done.  So watch that area, and reinforce it with shrink wrap or electrical table to reduce severe repe