@acejavelin:
Wasn't sure if you identified anything on your end yet. I recently made some VPN changes and at one site we started running into the frozen 'app loading' scenario again. Am checking with another site setup the same to see if theirs are as well.
This is pretty frustrating, am hoping we can get a solid solution other than reboot. (or mitel support blaming network issues)
New tunnels are now using ikev2 with different combinations for phase 1 and 2 encryption/hashing. Am going to look into our end more and see if there's anything else we can do on the firewall side (eg: mss-clamping) to help.