it's worth checking to see if someone else has posted while I was writing (note to self to re-boot brain)

Been there. My main beef is the BT (notso) HotSpot. It will disconnect when it feels like it, probably during your input and you only see it when you "send". It is unbelievably unprofessional now. They reduced the ads, and pepper it with news and more overtly clickbait. The update has the wonderful facility that refresh merely re-writes what you got, it doesn't poll the server. You have to open a new tab of the same page to reveal the log-in. This was not the case before, you could re-fresh and get the log-in. It takes time to rewire your brain to the new order. Personally I regard this as bad programming. I do have enough experience to validate that statement. I see no marketing benefit for such crass thinking.

On the back of all this - I am sure there are packets going missing, you can see it in the structure of their own homepage, at times. It may be a swag of JavaScript, certainly images fail, and then it says it has finished, with big black squares for images!

crash for unknown reasons means all postulation is on-side till proven otherwise! When I used to design with TTL (remember that?) there was a thing called race hazard. Think asynchronicity.
And Russian ain't off the hook - yet. PAL!

Don't forget - good advice is worth repeating. (Cntrl-A Cntrl-C Submit Check)