Freelander 2 (LR2) Speaker/Bluetooth Intermittent Break-Up

Hi all, looking for some help or guidance. Recently had to replace the Heater Resistor on my FL 2013 SD4 Lux, which is replaced via the Passenger's side footwell. Since doing that I am now experiencing intermittent cut-outs of my Bluetooth connection to my phone, which is accompanied by a crackling from the speaker system. I quickly thought that it must have ben something I disturbed when replacing the Heater Resistor, so headed to the two wiring looms which disappear up the LHS of the passenger footwell, adjacent to the door hinges. I noticed that I had not pushed one of the looms clips back into the hole, and when pulling the loom downwards, the speakers started cracking, and the Bluetooth disconnected. When pushing upwards, and pushing the loom clip back into the hole, the fault was gone. But I wasn't happy, as that stinks of a loose connection, which will usually mean the fault will come back. Lasted two days, and today the fault re-appeared, but only for an instance, the working again. So, any ideas, am I in the right place, and can anyone explain this to me? Also, will these two looms terminate in a connector or not? Thanks so much.