FreeBSD keep loosing ethernet connection

I have recently changed one of my long running boxes from Arch Linux
to FreeBSD 13.1, after which I see this in the log during file transfers:

<snip>
Dec  8 01:01:41 foo kernel: re0: watchdog timeout
Dec  8 01:01:41 foo kernel: re0: link state changed to DOWN
Dec  8 01:01:45 foo kernel: re0: link state changed to UP
Dec  8 01:01:51 foo kernel: re0: watchdog timeout
Dec  8 01:01:51 foo kernel: re0: link state changed to DOWN
Dec  8 01:01:55 foo kernel: re0: link state changed to UP
Dec  8 01:02:02 foo kernel: re0: watchdog timeout
Dec  8 01:02:02 foo kernel: re0: link state changed to DOWN
Dec  8 01:02:06 foo kernel: re0: link state changed to UP
Dec  8 01:02:18 foo kernel: re0: watchdog timeout
Dec  8 01:02:18 foo kernel: re0: link state changed to DOWN
Dec  8 01:02:22 foo kernel: re0: link state changed to UP
Dec  8 01:02:30 foo kernel: re0: watchdog timeout
Dec  8 01:02:30 foo kernel: re0: link state changed to DOWN
Dec  8 01:02:34 foo kernel: re0: link state changed to UP
Dec  8 01:02:45 foo kernel: re0: watchdog timeout
Dec  8 01:02:45 foo kernel: re0: link state changed to DOWN
Dec  8 01:02:49 foo kernel: re0: link state changed to UP
Dec  8 01:03:01 foo kernel: re0: watchdog timeout
Dec  8 01:03:01 foo kernel: re0: link state changed to DOWN
Dec  8 01:03:05 foo kernel: re0: link state changed to UP
Dec  8 01:03:14 foo kernel: re0: watchdog timeout
Dec  8 01:03:14 foo kernel: re0: link state changed to DOWN
Dec  8 01:03:18 foo kernel: re0: link state changed to UP
Dec  8 01:03:26 foo kernel: re0: watchdog timeout
Dec  8 01:03:26 foo kernel: re0: link state changed to DOWN
Dec  8 01:03:30 foo kernel: re0: link state changed to UP
Dec  8 01:03:47 foo kernel: re0: watchdog timeout
Dec  8 01:03:47 foo kernel: re0: link state changed to DOWN
Dec  8 01:03:51 foo kernel: re0: link state changed to UP
Dec  8 01:03:57 foo kernel: re0: watchdog timeout
Dec  8 01:03:57 foo kernel: re0: link state changed to DOWN
Dec  8 01:04:01 foo kernel: re0: link state changed to UP
Dec  8 01:04:31 foo kernel: re0: watchdog timeout
Dec  8 01:04:31 foo kernel: re0: link state changed to DOWN
Dec  8 01:04:35 foo kernel: re0: link state changed to UP
Dec  8 01:05:09 foo kernel: re0: watchdog timeout
Dec  8 01:05:09 foo kernel: re0: link state changed to DOWN
Dec  8 01:05:13 foo kernel: re0: link state changed to UP
Dec  8 01:13:39 foo kernel: re0: watchdog timeout
Dec  8 01:13:39 foo kernel: re0: link state changed to DOWN
Dec  8 01:13:41 foo kernel: .
Dec  8 01:13:42 foo kernel: , 52791.
Dec  8 01:13:43 foo kernel:
Dec  8 01:13:43 foo kernel: re0: link state changed to UP
Dec  8 01:13:44 foo kernel: .
</snip>

During which I eventually loose connection completely and have to
 manually reboot the box.

When I run Linux on the box all runs well, so I don't suspect the
ethernet card.

The card is setup with a static IP address:

ifconfig_re0="inet 192.168.1.3/24"

So it really should NOT change the state like this.

Any advice?

Kind regards.