In this period, space weather is a strong candidate for what you’re seeing, although your local setup can still contribute.
Strong ionospheric disturbances from geomagnetic storms or high solar activity degrade GNSS signal propagation and ionospheric modelling. When disturbance levels are high (high Kp index), RTK engines, including those using PointPerfect Flex corrections, may struggle to reliably resolve ambiguities and hold RTK-Fixed. The receiver can then remain in RTK-Float even under very good open-sky conditions.
What you can do:
- Check recent and current geomagnetic activity (Kp index, solar storms) for your region.
- Repeat your tests during a quiet ionospheric period and compare performance.
- If issues persist during quiet conditions, you can then focus more on configuration and local setup.
For more information regarding the forecast of the Kp index, please check this page: https://www.swpc.noaa.gov/