Ryobi fixed base router height adjustment problem

I bought a Ryobi fixed base router last year, it came with three bases, two of them are fixed base and one is plunge base.
The adjustment rings on the fixed base ones worked fine last year. However, after the winter, the adjustment rings on both bases are very stiff, very hard to turn, if not impossible.
Is there anybody have had this kind of problem and have a fix? or suggestions?
I have tried cleaning it with compressed air and brush.
Any suggestions are most welcome.
Peter
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Try a little paste wax on the base. Hank
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Thanks, I will try.
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