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Sometimes you can clear the airlock by covering the end of the kitchen mixer tap
Ugh - I'd almost forgotten the useless plumbing I had at a place i used to live - I ended up during rigging a pipe (with an oldmpiece of hose, some spare copper tubes and some compression joints) joining the hot & cold pipes that I could swap out with the flexi hoses and clear the airlock in the hot water system every time it went wrong.
NotThamesWater
Sounds as though you have an airlock.
Is your hot water from a cylinder rather than a combo boiler?
Have you had plumbing work done/pipes drained? How long has it been going on?
Sometimes you can clear the airlock by covering the end of the kitchen mixer tap and turning on the hot and cold - thus forces cold water at mains pressure back up the hot wTer pipes and eventually forces the air out into the cylinder.
If you have a combi and no cylinder I'm stumped.