This isn’t the first time we’ve seen issues with the NOAA-15 satellite. Last year the RTL-SDR blog posted about some issues the satellite was having.
These issues/errors appear to have been intermittent and even today these problems while apparent haven’t been constant. However, they do appear to be happening more and more frequently. There is a bit of uncertainly in the air about how much longer we’ll have this satellite and other which hold easily obtainable APT data.
We can only hope that this is just another intermittent problem but alas it seems like NOAA-15s clock is just about at its end.