Creusebear, sorry to hear about your encounter with the Prince of Darkness here in France, always thought that Mr. Lucas favoured car electrics during dark and rainy nights in the English countryside. Single track road, sharp bend, dark trees all around etc. Batteries in your torch also flat.
Okay, the same old song: in three-phase you get only 1/3 of your puissance souscrite per phase. Not too difficult to overload one of them. The reaction of your main switch, the Disjoncteur de Branchement (DB) is to switch off everything. Let's take an example of a 9 kVA three-phase abonnement. You'll get 45 amps, so 15 amps per phase. Not too much as you probably have noticed more than once. In single-phase the DB starts triggering above 45 amps, much more headroom. If you are going to be equipped with a LInky smartmeter in the near future the problem will only get worse, see this info about the trusty old DB.
Only if you have three-phase woodworking machines or a heat pump three-phase is useful. There is a standard tariff in the pricelist of ENEDIS for these change overs between mono or tri. For reference one of the many forum discussions, the French, the Brits, the Dutchies keep asking about the secrets of three-phase connections. Three-phase from here to your home.
About this ignition problem: these things are rather robust, no sensitive electronic components inside reacting with an auto-destruct behaviour as soon as a switch-on or sudden switch-off peak voltage enters your kitchen. All fuses okay? Tried the keep it simple and stupid (kiss) method, unplugged the kitchen equipment, voltage ok in your local socket?