EoIP tunnel disconnects

Hello I’m having a problem with an EoIP tunnel between 2 RB450 (OS v3.17), R1 and R2. Have created a EoIP tunnel and then bridge those interfaces to the nics, they work ok for a bit, and then after a while (no pattern in this time) the tunnel “hangs” and I cannot even ping the router interfaces from the other end router.

As I was saying , when I try to ping R2 from R1 it does not respond… but I can access other machines in the same network where R2 is located.

Any Ideas?