Chances are, the inside of the magazine is gummed up from the wax found on many types of target ammunition. Colder weather often amplifies the symptoms of this problem.

Use a .22 cal bore brush and rod to clean the inside front face (where the front of the bullets drag inside the magazine) of your mags. Any solvent works, and an airhose will take care of the rest. A light lubrication with thin gun oil or similar will also delay the problem from re-occuring, but it's not a matter of if, it's a matter of when. Sooner or later, anyone shooting wax coated exposed lead bullets in volume, will likely see this problem out in colder weather. (There were some excessively coated CCI Standard Velocity lots sold a few years back, that made this problem very evident. A search on RFC will turn up many discussions on the problems experienced by many members of that forum)

Shooting Mini Mags and the like will prevent the problem for a longer duration, but there is still some type of wax/lubricant on them too, and cleaning the magazines periodically is sane prevention.

ETA; Also, for future reference, this lube also builds up inside the front of the chamber, where the rifling begins. In time, it will be enough to cause misfeeds and misfires. It can be stubborn stuff to remove if left unattended. Keep this area clean also to ensure reliability.