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GPS not working correctly at the beginning of a running activity

Hi,
at almost every runactivity massive GPS outliers, this problem was not on my Forerunner 735 with which i ran the same tracks.
This problem appears on my Forerunner 955 solar after update to 12.23.
Here i have some data, hopefully someone has an idea how i can fix this.
Activity on 02.09.2022 at 18:25, Cycling, software 12.23
- Problem at minute 26:06 - 26:35 
Activity on 03.09.2022 at 00:11, Cycling, software 12.23
- Problem at minute 5:50 - 6:30
Activity on 03.09.2022 at 11:11, Cycling, software 12.23
- Problem at minute 7:00
Activity on 04.09.2022 at 07.16, Cycling, software 12.23
- Problem at minute 2:00
Activity on 06.09.2022 at 20:29, running, software 12.23
- Problem at minute 5:50 - 8:10
Same on 09.09.2022 at 19:22, running, software 12.23
So it goes on like this at amost every activity there are GPS-outliers which are not only near a Street but far away.
This leads to totaly wrong pace, and maybe to wrong conclusions in other metrics. On cycling i also have the same problem.
On 18.09.2022 i made a masterreset and maintained all new.
Activity on 09.10.2022 at 11:43, running, software 12.23
- Problem at minute 7:05 - 8:00
Activity on 10.10.2022 at 16:39, running, software:12.23
- Problem at minute 5:03 - 6:35, after this everything is normal
Activity on 16.10.2022 at 12:08, running, software: 12.23
- Problem at minute 38:05 - 38:10, before that everything is fine
The Masterreset does not help...
On 18.10.2022 i made an update to 12.27.
Aktivity on 18.10.2022 at 19:05, running, software: 12.27
- Problem at minute 2:12 - 3:33, after that everything was fine
Activity on 21.10.22 at 15:58, running, software: 12.27 
- Problem at minute 3:50 - 5:55, after that everything was fine
Activity on 25.10.22 at 18:21, cycling, software: 12.27, GPS "All Systems"
- Problem at minute 3:30 - 4:20, wow about 279,2 km/h in the city, after that everything was fine 
Activity on 25.10.22 at 19:06, running, software: 12.27, GPS "all Systems"
- Problem at minute 1:30 - 3:20, after that everything was finde
Activity on 25.10.22 at 20:44, cycling, software: 12.27, GPS: "all Systems"
- Problem minute 2:50 - 3:25, amasingly a ride with 62,2 km/h a nice on.
So, updating to 12.27 doesn't help on this problem.
I also changed recordingmethod from "intelligent" to "1 Second", with no change on my problem.
i also changed the GPS mode "only GPS", "all systems", "all systems + multiband" and "auto select"
I have no clue, what i can do to fix my problem.
I think i need help.
Stefan