slide issue

Just a heads up.I have the electric cable operation for the bedroom slide.Arrived at campground this afternoon went to put slide out about half way it started to sound like it was in a bind never any issue before.Went outside to check make sure was not hitting anything and look for issue there all O.K..Pulled slide back in worked normal.Had wife operate slide while I looked behind slide wall as it went out.It was hitting electrical junction box on floor that supplies 120 for slide motor.Had to lift bed and remove box to get slide open.Box is a 4 square metal box when screwed down it just clears frame for bed.Not sure why it hit box this time only one screw holding it and it was broken.Don't if it broke from hitting bed frame or it broke and caused frame to hit.Going to install a shallow box and at least 2 screws.No damage to anything just some thing you might want to check before a problem.