ZP instance hangs irregurlarly

I noticed since some days, that the instances of different projects are hanging from time to time while they are running. All projects run with just 1 instance at the same time and it seems quite irregularly. E.g. one instance posts PHP files from a folder to an API (so just open the local .php file and wait for loading and then delete it). Sometimes it runs for a couple of minutes and posts a bunch of files and then hangs for about 1 or 2 min befort it goes on. The other time it already stucks at start up for 5 min. then posts 2 or 3 files and hangs again for some minutes.
Also noticed that, if 2 projects (with 1 instance each) are running simultaneously, both seem to stuck at the same time and also for the same duration!

Please can someone help me with this issue?

Thank you.

I attached you a screenshot from the settings. The projects are quite different, e.g. one that makes a list of files within a specific folder on the system, and then open every file from that list in the browser on localhost (for posting to an external API). It runs till the list is empty. The list count varies from a couple of entries to maybe 2000 entries. Another project posts some content on the internet and another one creates accounts. All of them doesn't have many loops and the exit condition of the loops is quite low (mostly <10 till the loop exits).
The strange behaviour I noticed is that if "the stuck" appears all currently running projects start to stuck at the same moment and they also go back to normal run at the same time. Sometimes this happens with only one project running after a minute and sometimes there run 4-5 projects parallel and it occurs after 15 min.
I also did not notice that issue in the past (some weeks ago), so maybe it occurs only with one of the latest versions of ZP (5.15.0.0., 5.14.0.0).

any news on this? is it fixed in the latest version (5.16.0.1)?

ok, let me know if it works with the latest version. thank you.

ok I will try these settings and check if it solves the problem. thank you.

I tried the settings you recommended but with that ZP seems to work a lot more slowly than before!?

ok, thank you. I changed all projects that could run simultaneously to FF 52x64 engine (also the "Project in Project" ones). In some projects I need to check "Dedicated process" under Project settings because I use font emulation (and read in your changelog that this needs dedicated process).

Additional question: If I use "Dedicated process" under Project settings in a project that calls another project via "Project in Project" (where "Dedicated process" is not checked) will then this linked project also automatically use a dedicated process or not?

I realized that in my ZP settings was under "Other settings" the setting "Monitor threads status" checked (I think I forgot to uncheck when I sent my last bug report). Now I unchecked it, added the settings from VladZen's post above and changed the browser engine to FF 52x64 in all projects and now it seems to work much faster withoung hangs.