As NDIY says probably lack of lube. I never use my back gear now with the VFD but still give it a spot of oil now and then just in case. I always found when I did use it that a little twist of the chuck helped the engagement. I am sure you are aware that there are 2 oil points, 1. the hole above the back gear lever & 2. the oiler in the centre of the shaft in the housing.
regards
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