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I adjusted the bypass pressure a bit higher, I figured it might bleed better with more pressure. So far so good.

I'm not sure, the problem is intermittent and we never use the hot water tap long enough to become apparent. Flow rate is more than double of the minimum required.

I'm hoping somebody here could point me in the right direction. I've got a Vaillant Ecotec Plus vhr 25-32cs 1-5. Everything in this system is new since August this year. Since a few weeks the hot water goes cold during showering, stays cold for a bit and then comes back again. Sometimes it's...