I'm sure there is some testing tools you can pick up at either a home improvement store or an electronics distributor. Or maybe just get an electrician to stop by who has all the testing/meter tools and may be able to isolate the problem. If the problem does not occur at your friends house, the shop, neighbors, or wherever else you've tried it, only at your house, it has to be something in your wiring. Especially if you say you have other electronic equipment acting strange.

good luck

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