Zmanwa

My battery powered rigid oscillating tool has trouble turning on/staying on. Lithium battery charges just fine. Put it in, nothing. The issue seems (not sure) to be with the connection between tool motorized core and the tool end. I push, pull, wait, and then at some point it will work. Goes a while, then stops. For no apparent reason will start again. I suspect there is a bad connection between the two. I'm just not sure what is actually going on or how to solve this. Any thoughts or answers?