Hi there, I am riding daily and since June on a Trek Soho 2. This bike rides nice, however almost after each ride I notice that the chain loosens and needs to be re-tensioned at least once a week. Does anyone have a tip? The bike has an internal shimano nexus hub and to tension the chain, I need to loosen the bolt on the chain side, pull the weel backwards and re tighten the bolt- To get the wheel in line I sometimes also need to loosen the bolt on the other side and do the same. This sucks, I thought that the chain would settle in after time?