The Emotive Epoc I have been working with can sometimes be troublesome to maintain. I found out that the device had not been used in quite a while and needed some care before I could begin working with it. The headset uses a sensor that is only ready to record when wet (the solution we use is simple saline/contact lens solution). To keep the sensors moist it the Epoc uses felt pads above each of the sensors.
These pads do deteriorate rather quickly and must be replaced. We first attempted ordering replacements but found that the Emotiv website had them listed as sold out. Rather than let this halt our progress, I was able to fashion a solution using felt pads at the recommendation of Dr. Banic. The felt pads can be replaced with felt pads that are used to keep furniture from scratching hard-wood floors. After cutting them down to the correct size and letting them soften in saline solution I was able to fit them into the Epoc and begin reading brainwave data again. These felt pads are much sturdier than the previous ones and I highly recommend them as a solution to all who are facing similar felt pad problems.

Emotiv Epoc (developer) (Photo credit: drbakkerall who are facing a similar problem.