I’ve just finished a 7hr 40ish minute flight from EGPH to KJFK, no problems whatsoever apart from BATC leaving me to it near Boston, but that’s a story for another day. I’ve also got Apronlife Pro and a bunch of other addons running.
My flow for installing any aircraft (PC) is uninstall the old version, clear out WASM files, reinstall new version, run the sim, load the aircraft at a random field, check Nav data, check everything functions, close down the sim and restart. I used to also get a WASM crash with any Inibuilds plane (except the TriStar) but since adopting the above, I’ve been WASM free… so far. 
I believe any aircraft with WASM is super sensitive to that first initial load up in the sim. If anything interrupts it or something doesn’t bed in or register properly (hence restarting the sim after first load in), it either causes an obvious crash or a ticking time bomb crash that happens late on.