Hi
I might not have a full picture but the orange related bug - only for French and Belgium networks- was kinda drastic, users couldn’t operate the phone.
Other bugs connected to quickstep looked more like what you described, the phone getting laggy, not responsive, recent apps not showing.
There’s a nice thread on alternative launchers
I tested Nova. Pear, now am on Lawnchair. I am generally happy yet, sometimes I have exactly the issues you mentioned