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I had the same problem with my mini. Well, really i had the same problem on two minis. They were my first printers and both bed heaters went bad over time. The same as yours, they slowly declined in temperature. They both got to the point that the bed would never heat up no matter what i did. I never tried any fixes because i didnt know they existed. I did some digging and lots of people have the same problem. Something to do with the heating element. Now I will mention that i did not have both printers at the same time. The first one went bad and the second one was a replacement using the warranty from the company monoprice, but it to went bad. When did you purchase yours and can you still use the warrenty? The best solution I can see is using the warranty. I hate to be so doom and gloom, but that printer was nothing but trouble for me. Sorry for your misfortune and I hope you can resolve the issue soon.