During one maintenace inspection, I checked it as per usual and discovered that the tip of the suction catheter had melted into the end of the tubing, and there was what appeared to be black residue on the unit, so am not sure if there was some kind of chemical reaction between the yankauer tip and the tubing, or whether the machine overheated for some reason in the cabinet. Tech support said they'd never heard of that happening before.
Also have had issues several times with the internal batteries failing in some way. I am trying to determine if we've just had a run of bad luck with this piece of equipment or if we have some kind of electrical problem with some of the outlets.
Granted, we are a very rural BLS service, and in all the time we've had this piece of equipment, I've never actually had to use it. I've gotten it out and hauled it in, but we've always used the in-line suction when we've needed it.
But I do maintenance checks on it regularly.
(Hurriedly knocks on wood!!!)