My 5 accounts (all currently without Endless Reserve) have been upgrading Troops|Weapons since the update.
All have been okay.
Note, I have had 3/5 accounts fail the Hero upgrades.
One option someone suggested is to be on-line in the final stages [last 1-2 hours] of Troop|Weapon upgrade and pop a few Diamonds to quick finish. I've actually done this as a tester and to be sure of my Level 5 Kavan, so it even worked for me on in the Hero Hut. Also did it on an Armory building level upgrade as I was near overflowing with Gold and really needed to purge some [Hero Hut out of order on that account].