Sticky shift lever on hot days

My 2000 Camry --4 cyc has a problem with the shift lever on hot days. It is hard to move from P to R to N to D and the other way back to P. There has never been any liquid spill on it. In cold days, the lever shifts fine. Does anybody have any idea?

There is a service bulletin for Canada #1124 that is for your problem. It replaces a pin on the Automatic Transmission shift linkage.

Thanks to knfenimore’s reply but I could not get a copy of the service bulletin for Canada #1124. An independent garage changed the shift cable for $500 and the problem is gone for now.