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My Hotpoint dryer is cutting out after about 5 minutes of the cycle,
each time you switch it back on it does less and less time until it
refuses to be switched on again - any ideas what we might need to
replace to fix this?

Have you given it a really thorough de-fluff? Not just the filter but
taken it apart and remove the pillowcase full of hidden stuff?

--
Skipweasel
Pay no attention to that man behind the curtain.