The hosting service that we are using now!
VPSLink.
Quite stable one.
Uptime is 99%.
During last month noticed that file system I/O is heavy and taking 1-3 sec only for response even if there only simple hello word in php script.
Might be related to small RAM (256) but sime ls -al command also taking long to run when there are 10-15 files in folder.
Thinking. We will need more RAM. So thinking about moving to dedicated hosting.