My 15 inch 2018 MBP (2.6ghz i7, 32gb, 560X, 1TB) is plugged in but showing as not charging, and is in fact decreasing in battery life (meaning that even though it is plugged in it seems that eventually it will just switch off). Sometimes it starts to charge but eventually stops. I have tried different wall sockets and the different USB C ports on the Mac to no avail. This is concerning a) because this is a new machine and b) because I don't have access to an Apple Store at the moment because I am out of the country and need my Mac for photo/video editing. I will be able to go on Saturday but am hoping that this is a temporary issue. SMC reset has made no difference. Thanks in advance for any help.