The CRC errors are light but for the moment, the tunnel is up. I will check next time the tunnel goes down if the CRC are increasing but it seems to be the only errors encountering in the vpn router.

I will get in touch with the provider. Thanks !

there are CRC errors but in 20 minutes they are 29 and you have received 19000 packets.
Unless these errors come in bursts (many in a row) they shouldn’t be able to turn down the IPSec session.

the current DSL line parameters are good with 20 DB of noise margin. There are no reed salomon errors.

On a line always there are some errors the problem starts if they are able to affect traffic.

From current statistics it is unlike they can cause issues just a slight performance reduction.

The scenario probably was far worse in the past hours.

I would ask to the DSL provider a check of the line.