Thanks for playing our game! As Chris mentioned above, switching to an experimental branch should help with the crashes you've been experiencing. Although I'd like to ask a few questions as well as I attempt to reproduce the crashes you've reported on my end.
For the first bug, Crash when coming back to geoscape from ground mission - it looks like a different bug report file was attached as the crash report contained within looks like it was from the start of the campaign, rather than from returning from a GC mission. Crashes from the start of the campaign should be fixed by switching to 4.22, as that was caused by having your game set to a different language.
For the second bug, Crash trying to climb a structure, clicked on container - I'd really appreciate if you can provide more detailed information regarding the commands you've issued to your soldiers prior to the crash as I've been unable to reproduce the crash from loading your save. What I've done so far is issue an order to the soldier closest to the ladder (soldier 2, Ivan Ivonenko) and while he's mid-action, click on the container taken by the snapshot at the time of the crash. Is there anything I might've missed in the reproduction step?
Lastly, for crashes that happen while the enemy turn is being processed, I suggest switching to the experimental branch as the most recent patch contains fixes related to this. I tried loading your save here on 4.22 and the enemy turn was able to successfully resolve without crashing, so it should work fine on your end as well.