Interesting if Costco limits replacements claiming you damaged a HA. I have had my left Quattro fail FOUR times in 2.5 years (about every 6 to 8 months). The right one lasted 2.5 years before failing in the same way(streaming works great, external microphones stopping working, especially at high frequencies; booting HA, rattling, talking, chewing, revive HA function for a minute or two => loose connection?). I don’t think there was any environmental damage, except possibly using a Jodi-Vac every day on the microphone and receiver openings and gently blowing the microphone openings at a very oblique angle with a gas duster (only a slight hiss sound and a gas current that mildly tickles fingertip) could be responsible. In returning the HA’s, I gave a full description of everything I might have done myself to cause failure, including mildly sweating for the first few failures.
Each time, through my audi, the defective HA was sent in and ReSound replaced it with a new Quattro (I’m told by audi the body, wires, and receiver were brand new each time).
So if Costco is stingy on mysterious HA failures, that would be a slight vote (for me) towards paying more to get my next HA’s (whatever they are) through TruHearing.com and continue on with my very helpful and patient audi!
The 1x replacement, no-questions-asked replacement under my purchase agreement is if it’s clear that my use lead to the failure, I step on the HA or the dog eats the device. Perhaps a claim of sweat is “misuse” but I think any HA brand and any retailer that uses that as an excuse are going to lose a lot of business. Folks will flock to the most sweat-resistant HA’s and whoever builds a better mousetrap in that regard will likely garner a lot of the migrating business.