I am sorry you are experiencing problem with the gateway, the latest gateway version addressed an issue  regarding some MQTT interactions. There is no reason why it would have any persistence after you downgraded to an earlier version.

Could you answer the following questions for me to help me pinpoint the problem.

1. Are you using WiFi or Ethernet?
2. When the gateway is unresponsive, do you see the one LED on the gateway continue to blink regularly?