I received a new bike from SportsHQ last week and the pedal assist kept cutting out as I rode it. I waggled the two smaller wires to the controller and the batter indicator cuts in/out. I opened up the controller case to see if there was anything obvious but was met with a whole raft of wires! Some plugged, some not. It wont go at all now. Is it an easy fix or shall I just return it to SportsHQ ? I don't want to invalidate the warranty but also don't want the hassle of returning it if its a very easy fix.