Only have had this issue on the 787-9. Don’t know what’s causing it as it happens while I step away on these longer flights. The ANP is exceeding the RNP limits as shown on Progress Page 4 and on the ND. There is also a yellow bar on the PFD which shows up only when this issue occurs. This is not the first instance of this happening.
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@TheSevenflyer Very alibistic, becasue 787-9 uses default 78X systems by Asobo
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@Seifer465 it happens to me during multiple flights without restarting the game or quitting to menu. For example I fly two flights between two destinations. I go for example from Toronto to Vancouver and back to Vancouver.
At Toronto I set POS to CYYZ and it is fine. I land at Vancouver and start preparing my flight to Toronto. Aircraft is in cold and dark state. After I start the aircraft again the POS page in FMC contains old gps ifnormations from CYYZ (Toronto). I force rewrite to CYVR (Vancouver). I do that on both FMCs, the GPS is little bit ofset but it increases as I fly further from Vancouver back to Toronto. It is definitely a bug if you ask me.
MSFS will only look into issues with stock aircraft.
If the issue occurs with the default 78x, and is reproducible, a Bug Report can certainly be entered.
This is clearly stated in the Bug Report category requirements.
Issues involving third party aircraft like the 787-9 are best brought to that developers attention.
Persons with MSFS issues that require support can also enter a Request for Support with Zendesk.