What has changed in firmware 6.42.x?

Question

Mikrotik

Good afternoon. Interested in what has changed in the latest firmware compared to 6.39. The bottom line is that we have rb2011 on firmware 6.42, it hangs and bugs up to spontaneous reboots. From what is currently working on the combat router: l2tp + radius, wifi, nat (10 rules: web, mail server, a couple of special programs)
From what you need: what you have + 5 vlan networks. On the virtual machine, the Mikrotik router OS 6.42 is up, everything is set up and it seems to even work stably, but I'm afraid that when transferring the config, I will again catch freezing dumps and glitches.

Answer 1

changelog . Do a downgrade.

Answer 2

Routers of different models, incl. RB2011, RB1100, RB912, RB951. RouterOS version 6.42.1. It works l2tp, sstp, radius, a dozen vlan, NAT, mangle, firewall (on the fattest router there are hundreds of two firewall rules in total). As well as simple queues, OSPF, GRE tunnels, IPSec by certificates, capsman, WiFi and hotspots.
Since April 25, the flight has been normal, there have been no unplanned reboots.
Maybe there is a problem with the config?