Hi, I have a Casio WK - 6600 which I've owned for approx 5 years. Never had any issues until about a week ago I noticed that the E key right at the low end was sometimes failing to produce any sound, then last night it was producing no sound whatsoever and the F key next to it was also becoming temperamental, as well as an A key towards the higher end.
Today I used a vacuum cleaner on the keys and tried them again and they're all working fine, except for the low end E which, though working better than it was, still isn't 100% and seems to only produce sound with every second touch or so.
Any advice would be greatly appreciated. Thanks.
