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A number of possibilities:
1. Any plumbing / heating work (e.g. new boiler) recently?
2. Could be the filters / non-return valves for the shower need cleaning.
3. Could be the thermostatic element in the shower failing.

What sort of boiler - make, model?
 
there is a device called Aquareturn, it does not let water come out of the tap till it is hot, therefore you don't waste water at all
I hope this helps
 
Nothing in the video, but according to the website it pumps the cold water back to the boiler until it's hot.
Which then asks the question, what happens when the kitchen sink cold water tap is opened whilst this is going on?

I really don't know; we don't make these devices, we make shower timers with shut off, so don't really know how Aquareturn works; you can write an email to them; I do know these people speak English.
regards
 
Nothing in the video, but according to the website it pumps the cold water back to the boiler until it's hot.
Which then asks the question, what happens when the kitchen sink cold water tap is opened whilst this is going on?

So makes the cold into a secondary return I guess it could effect it as there’s a good chance you could get Luke warm water out of it
 
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