Over the past few months my DD-7 will turn red and the delay won't work; just a dry signal with no response to turning it on or off, or using the tap tempo pedal I have for it. Sometimes unplugging the power supply with fix it, but recently it just gets stuck until it decides to work, which I'm afraid it may decide to stop working.

Has anyone had a similar problem, or know how to fix this? I bought it used and I gig with it every week, so it's had quite a bit of use.
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