Welcome to the forum there are many great people on here also welcome to the great hobby. Yes it could be the cold that is making you leave the glow plug on it longeruntilthe engine gets warmed up so I would doubt it very seriously if there is a problem should run a lot better for you once the weather warms back up some. Yes it does seems that the servos are always the first to go as stated above. Please enjoy your new hobby and if you have any questions or problems you can ask it here there are so many great people who are willing to help.