VW 9.xx https seems buggy

Hi,

I have a problem that I'm not able to catch, that seems related to using
HttpClient/HttpRequest  and calling https sites.

I do a lot of calls to external API (many threads, sometimes around 50/60
or more), and I get random time-outs and also image crashes.
Also calling a single thread gives timeouts.
If I switch from https to http, everything goes fine. (I did the test
interposing a simple proxy converting http to https). I'm sure the problem
is not on the server because I did a simple test using .NET with some of
the API with problems. If I do the same call on .NET  I get no problems at
all.
Someone having the same scenario without problems?
BTW: I did test on Windows and Linux, same results

Thanks a lot for any help or any hint

ciao

giorgio