MikroTik

I have several CCR1036 installed in different locations. To check the devices connected to the 1036 I ping the devices every few minutes. Since I installed the CCR1036 with 7.2.1 firmware the ping fails randomly for a day, I can't ping any device or the internet but flood ping works.
Is this happening to anyone else? Do you know any solution to this issue other than upgrading the firmware?

Are you using Netwatch?

Yes I use netwatch. My problem is that my mikrotik can't ping anything(neither wan or lan) but flood ping works fine. After some hours ping starts to work without changing the configuration. If I reboot the mikrotik when ping fails the configuration is corrupted(Bridge dissapears for example)