My Memorex clip & play mp3 won't stay on.
Don't know if this can be regarded as a fix, but it may help deal with the issue- keep the lock set on, only unlocking it briefly enough to make keypresses, after which you immediately set it back on lock. If the problem your unit has is the same as with mine, you will see LOCKED pop up on the screen randomly even when you are not pressing any keys. So there is a mechanical problem with the keyboard, some kind of electrical interference being interpreted as a keypress, or buffered keypresses.
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