[LinuxPPS] weird behaviour again

[Udo van den Heuvel]

Since the latest reboot I see behaviour like below.
It is the same Garmin GPS18 with no changes to the config.
The links in /dev/ are OK.

# ntpq -pn
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 127.127.1.0     .LOCL.          10 l   55   64  377    0.000    0.000
 0.001
x127.127.20.0    .GPS.            0 l    5   16  377    0.000  -174.44
 1.507
 194.109.22.18   193.79.237.14    2 u  181  512  377    7.988   -9.848
 1.035
+193.67.79.202   .GPS.            1 u  256  512  377   15.786   -3.441
 5.483
*193.79.237.14   .GPS.            1 u  331  512  377   15.398   -2.652
 6.119
-213.84.46.114   192.87.106.2     2 u  159  512  377   16.030   -4.163
 3.544
[etc]

I did reset the GPS and restart ntpd. No change.
What could be wrong?