Could probably be that the shared memory (at least in the past) also was used for cache, so the same mechanism that probably sanitizer the cache is/was in play here.
It might be their crappy DNS virgin is running. Had a big issue pulling big repos with git (TLS error) before I switched my DNS. Same with accessing certain websites when I had my vpn on. Ever since I got my eeros so I can set the dns network wide(virgin does not allow custom dns), no problems.