My hearing aid works fine in the morning and gradually fades over the day - it never used to do this. What could be the problem?

It could be an accumulation of moisture in the hearing aids. There are a few things you can do to limit moisture buildup. Consider these tips for cruises or trips to hot, humid countries. 

1. Store hearing aids in a "Dri-Aid" Kit or a system that sanitizes and dries called a Dry and Store kit.
2. With behind-the-ear style hearing aids, invest in an "Air Blower" for the earmold tubing / purchase extra earhooks. There are consumer devices available for drying out moisture /wax. This is a more costly (approx.$350) but effective alternative.