Not sure if you made any more progress on this, but I have exactly the same issue with a couple of 2 gang and a single gang Yagusmart switches. Strangely a 3 gang bought at the same time works without the 2 min issue.
In any case, I had am a complete noob with ST, however I had a look at the default DH for multi-switch to try and compare to the multi switch power. I noticed at the bottom there was an entry for a Orvibo switch to disable a 2 min heart beat. It sounded interesting so I copied my manufacturer ID (_TZ3000_fvh3pjaz) in instead of Orvibo and published the DH - and it works! Or at least seems to, created switch and child switch for my 2 gang and it has been on for 30 mins now without problem.
I am going to try this now with the single gang and also the other 2 gang and confirm.