SNMPv3 and Cisco IOS upgrade

I have been using SNMPv3 for monitoring my Cisco ISRG2 routers for a few years now and has worked great except the last 2 IOS upgrades.

Once we upgrade the IOS on the router I'm unable to gather stat's in NPM or NCM from the router until I re-apply the SNMPv3 user commands on the router.

INFO on this Upgrade:

IOS versions 15.2.4-M6a to 15.2.4-M7

Router platforms: ISRG2 1941, 2911, 3945

IOS Command: snmp-server user solarwinds NPM v3 auth md5 XXXXXX priv aes 128 XXXXXX

Looking to see if anybody else has run into this and any info on a resolution, a real pain in the **** re-applying the commands on over 200 routers.

Thanks Tom