R
that does not sound anything like fuel starvation, your most likely cause is the solenoid has gone faulty, and after heating for about 30mins is going 'open circuit' and may need replacing.
(after your 20/30 minutes it is cooling back down and allowing it to work once again)
Turned out to be a faulty control box. New one installed and its working fine again.
Very rare for them to fail, I can't remember the last time I changed one.
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