You already should be looping your playing while listening to a metronome or rhythm before you start. Then start to record the loop without stopping yourself playing, neither from the beginning, nor at the end. Furthermore try to use half speed option to be able to loop a long part instead if a short one to reduce time errors.

Of course it is also a matter of practise for your feet.

+1 to mazuwa

You need to be playing the loop section repeatedlyas you punch in and out of record mode at the correct points and then there should be no gap. It takes practice though. However if you are already doing this and still have an issue, try Jim's suggestion to reset the POD's global settings.

Nick

This may also help....

http://line6.com/support/thread/76582