I have tried manual searches since the beginning.
They only return torrents. Never got a single newsgroup result.
I have tried changing the link by replacing 5030,5040 with
1000
2000
2030
2040
3000
5000
2030,2040
When doing this the link works 100% perfect all the time.
It seems just the 5030 and 5040 that give incorrect results.