Pat, The keys are probably sticking because of swelling due to humidity/damp It will go away when the weather is drier or put the HG somewhere dry for a few hours Ebony keyshafts seem much less prone to this
Keys made of beech or similar hardwood can be very sensitive to damp conditions One raindrop on the back of the keybox can make the HG unplayable Candle wax I don't know about Teflon powder (wheel death Alden calls it) applied sparingly and carefully is magic It also speeds up the key action generally and makes it much easier to play fast passages. Real solution is to get a luthier to refit the offending keys If the HG is a well known budget european model, this is a common problem Graham
