String of lights not working correctly

[Jonnyoxford]

Hi 

I have a large tree that I have wrapped lights up the trunk and each individual limb. Recently one limb has been acting strangely and occasionally when the sequence has finished remaining on. 

I think it is a connection issue so I have cleaned and tightened them all and it was OK for a few days. Now when there is a problem I can just go to the falcon controller unplug the connection and replug and it fixes it, so now I am doubtful that it is a bad connection. 

I have some spare ports on the board so tomorrow I will move it over and see if I experience the same issue. 

Any thoughts would be appreciated. 

Thanks