GPS location error causes GRID error

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vk6kEd
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Last seen: 22 hours 50 min ago
Joined: 2021/12/14 - 10:12
GPS location error causes GRID error

Hi Guys,
if this problem has been reported and fixed before...

I have noticed that stations have reported my WSPR GRID to jump to somewhere else.
The first time I noticed this, I power reset my TX unit and this fixed the issue. Then about the same time a day later I noticed my location had jumped again, but corrected itself.
I noticed on my Tx module display that my GPS coordinates had jumped, so the software lat lon to GRID function is probably ok.

Further software info:
TinyGPSPlus.h
TimeLib.h
SoftwareSerial.h
LiquidCrystal.h
Si5351.h
JTEncode.h

hardware info: GPS u-blox NEO-7M Micro Uno R3 (clone)
Spot reports:

2022-01-07 22:12 VK6KED OF77vw VK6RWS OF77ww 18.106112 0.05 -24 0 8 2 160 53 2.5.2
2022-01-07 21:44 VK6KED OF58 VK6RWS OF77ww 18.106091 0.05 -22 0 469 2 9380 3648 2.5.2
2022-01-07 21:32 VK6KED OF58 VK6RWS OF77ww 18.106091 0.05 -23 0 469 2 9380 3387 2.5.2
2022-01-07 21:04 VK6KED OF58 VK6RWS OF77ww 18.106089 0.05 -31 0 469 2 9380 1303 2.5.2
2022-01-07 20:52 VK6KED OF58 VK6RWS OF77ww 18.106089 0.05 -23 0 469 2 9380 3387 2.5.2
2022-01-07 20:32 VK6KED OF77vw VK6RWS OF77ww 18.106088 0.05 -24 0 8 2 160 53 2.5.2

2022-01-08 20:52 VK6KED OF77vw VK6RWS OF77ww 18.10611 0.05 -30 0 8 2 160 27 2.5.2
2022-01-08 20:48 VK6KED OF85 VK1FOC/4QG62jv 18.106154 0.05 -22 -1 3501 2 70020 27230
2022-01-08 20:44 VK6KED OF85 VK1FOC/4QG62jv 18.106153 0.05 -24 -1 3501 2 70020 23340
2022-01-08 20:40 VK6KED OF95 VK1FOC/4QG62jv 18.106153 0.05 -27 -1 3318 2 66360 16590
2022-01-08 20:32 VK6KED OF77vw VK6RWS OF77ww 18.106109 0.05 -30 -1 8 2 160 27 2.5.2

My location is OF77vw.
Any ideas how to fix this issue?

Thanks..