The issue seems to have been finally resolved by deselecting the option “Use Network APN” as the Mikrotik support was hinting at.
In this case, only one or two packages are lost during the ISP disconnection which is more than acceptable:

The issue seems to have been finally resolved by deselecting the option “Use Network APN” as the Mikrotik support was hinting at.
In this case, only one or two packages are lost during the ISP disconnection which is more than acceptable:
