2007G2RDX

Hello new to the post. Have a 2007 RDX and when using the wipers they seem to stay on- they work- but eventually when they finish their cycle they with stop mid way across the windshield or at the start. Then you have to redo the wiper motion and it may or may not stop at the base of the windshield. Is this a switch or relay thing? Anyone else have this issue? Thanks Steve