Hi,
you may want to check your clock calibration.
either against a neighbor cell or if installed as option the gps clock
source.
clock calibration is a value stored on the device and can be overridden
in config in case it drifted too far over time.
this is not uncommon since the crystals age with use and time.
a recalibration every few years should be enough in most cases.
the behavior of the phone sounds a lot like what happens if the phone
gets confusing clock-references from the networks it can receive and at
some point decides which one is 'right' and ignores whats not fitting
that raster.
regards
--
- Joachim Steiger <jstei...@sysmocom.de> http://www.sysmocom.de/
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