Before I go completely out of my mind, your thoughts please. 18 months ago I purchased a Little MarkIII and NY121. Plugged in and switched on, with passive bass, new leads and cables, no clipping. Big fuzz and then power cut out. Switched on again and same thing, distorted signal, power cut out. Company sent me new LM3. Over the next year, signal distortion would occur intermittently, sometimes a fluttering in power up before I played a note, when setting level on output pot. LM3 went back to company for repair three times without successfully repairing. They sent me a new one, I just switched it on, immediately I heard fluttering and in practice I heard a brief click/pop. Is this normal? am I unlucky? fussy? Is it the Cabinet???!!! Am I losing my marbles.