Error 503 first byte timeout

first byte timeout

Guru Mediation:

Details: cache-ord1723-ORD 1506040888 3085135254

Varnish cache server

Can't share large zip files with clients.  Recent development, that has always worked before.  Some have previously had the same problem, but no real solutions offered.  Any ideas when Adobe engineers will fix this major issue with sharing public files? 

Customer support is a nightmare.  Obviously Adobe problem.  Contacted multiple times over a week or so, and no help what so ever.

Clients can't download.   Seems to have been a problem for years.  Service help is terrible.