RB2011UAS-2HnD stops responding spontaneously

Up time was only 5 hours last go around. What version is the suggested downgrade? I’d prefer not to have to go all the way back to 5.24 since the queues are redone for version 6 and all the ipsec configuration scripts had to be updated with “aes-256-cbc” instead of aes-256. I don’t know why MikroTik changes simple things like that which break backwards compatibility with configuration scripts.