Hello Martin,
this error is usually to large notes that SNOTE tries to download, and get timed out because of parameter rdisp/max_wprun_time. You can try to increase it to a higher level, or set it to zero (which means unlimited).
Alternatively (and as a general solution for big notes), you can manually download the notes to your workstation (outside SNOTE) and then upload then in SNOTE --> Goto --> Upload SAP note (notes will be in .DAT extension, like NOTE0001616726.DAT and NOTE0001608417.DAT on your case).
I hope this helps.
Best regards,
Tomas Black