I've got some KStars logs and the PHD2 related. I attach them.
At first DEC mode south was selected, because it doesn't fail, then changed to DEC mode auto that failed a few time after.
23:32:12 - DEC south mode guiding
23:34:00 - Changed to DEC mode auto
23:35:20 - Guiding failed
Here are some guiding logs that I've found. Sorry but I don't understand INDI logs between them (as you can see, logs are in spanish, sorry about that):
[2020-09-23T23:28:07.406 CEST INFO ][ org.kde.kstars.ekos.guide] - "PHD2: Guiding started."
[2020-09-23T23:28:07.427 CEST INFO ][ org.kde.kstars.ekos.guide] - "Guiado automático iniciado."
[2020-09-23T23:28:07.516 CEST INFO ][ org.kde.kstars.ekos.guide] - "PHD2: Tiempo de exposición fijado a: 1.50"
[2020-09-23T23:28:07.555 CEST INFO ][ org.kde.kstars.ekos.guide] - "PHD2: Modo de guiado DEC fijado a: South"
[2020-09-23T23:34:07.647 CEST DEBG ][ org.kde.kstars.ekos.guide] - PHD2: event: "{\"Event\":\"GuideParamChange\",\"Timestamp\":1600896847.633,\"Host\":\"astroberry\",\"Inst\":1,\"Name\":\"Dec Guide Mode\",\"Value\":\"Auto\"}\r\n"
[2020-09-23T23:34:07.648 CEST DEBG ][ org.kde.kstars.ekos.guide] - PHD2: event: "{\"Event\":\"ConfigurationChange\",\"Timestamp\":1600896847.633,\"Host\":\"astroberry\",\"Inst\":1}\r\n"
[2020-09-23T23:34:07.649 CEST INFO ][ org.kde.kstars.ekos.guide] - "Evento de PHD2 desconocido: ConfigurationChange"
...
[2020-09-23T23:36:12.552 CEST INFO ][ org.kde.kstars.ekos.guide] - "PHD2: Guiado automático detenido."
[2020-09-23T23:36:12.570 CEST DEBG ][ org.kde.kstars.ekos.capture] - Guiding state changed from "Guiding" to "Aborted"
[2020-09-23T23:36:12.571 CEST INFO ][ org.kde.kstars.ekos.guide] - "Guiado automático interrumpido."
Then, I tried DEC mode north too:
23:37:00 - DEC south mode guiding started
23:41:15 - Changed to DEC mode north
23:43:50 - Guiding failed