Crash every 5minutes (aprox)

Hello,
I’ve a RB450 with Mikrotik it was working fine, but now I did a upgrade to the latest version and the device start working strange (the ping from PC to Internet and mikrotik only work for aprox. 4-5minutes, after this time the system crash and I need to reset manually) I try with reset-configuration, also the watchdog is disabled.

Any idea?

Best regards

I think that the new version maybe fix some bugs.
I found another fact, the crash time is not 5minutes, it moves between 1 minute (downloading 4 big files and 10minutes if the connection is Idle).
Maybe a hardware failure??

Best regards

i have some rb/450 with 3.24 but without any problem… umm do you have PPTP server on this RB?

No, I reset the configuration and I only have:
-1 dhcp client
-nat masquerade
-dhcp server