I have the same adapter (in a Lenovo Legion Y530) and I had to turn aspm off for the wireless adapter.
Create a new r8822be.conf file in /etc/modprobe.d/, with the following contents:
options r8822be aspm=0
After this, I also had to turn off the laptop, unplug the charger, wait for a few minutes, and turn it back on. No more wireless issues after this.