Just thought I'd post an interesting comment from one of the OSM admin team:
The tile.openstreetmap.org CDN is at breaking point.So, if you're using OSM's main tile servers, please do NOT do massive downloads of tiles. We don't want APRSISCE/32 to be blocked for everyone.
If you want to download large areas of tiles for offline use, you can set up a Configure / Map / Tile Set pointing to my current OSM tile server. It's slow, but it'll eventually deliver your tiles.
Server: ldeffenb.dnsalias.net : 14171
Min: 0 Retain:8 Max:20
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
PS. Note that my ports 6360 and 14160 current deliver OSM tiles from b.tile.openstreetmap.org. If you have a tileset specifying one of these ports, please consider changing it to 14171 if you can stand the lag.