I have my WP40's for about a year now. They were both running beautifully until I came home one night to 1 of the pumps being off. I unplugged the waterproof connector then reconnected and it went back on. Both pumps hadn't been cleaned since placing in the tank so I decided to give both a vinegar bath. After the bath they both worked impressively...in W1 they both created a beautiful wave however I came home from work 1 night later and the other pump had shut off. I tried putting the old controller back on, (I have the older less versatile controller and then the updated S1, S2, S3 controller), no change... in fact sometimes when I thought the units were completely off they were just running at a lower voltage/speed/mode....say 25% ...but that was without the light sensor and without me switching to lower power on the controller. I can't keep coming home to no flow and it's a drag to have to disconnect/reconnect to get them to work again. Has anybody had this issue? If so, any solutions?