You need to help us with a bit more diagnosis as requested. You might get away with taking your car to the garage and saying "It's not working" but they can at least get hands on and look around to see what they can find.
If members ask for information, it is in an effort to help. Just saying "It used to work" doesn't really help us. Software will continue to run unless:-
- It is designed to complete a process and stop
- It encounters an unexpected condition and aborts
- There has been a hardware failure that cripples the server or the OS is shutdown
- The software is requested to stop or processes killed off.
- Something has changed on either client or server
- The software has a licence that has expired (especially evaluation software)
- Not necessarily an exhaustive list
Which fits you?
Being "quite critical" doesn't mean we can help you any more. We will do our best, but if you need more, you would be better contacting the supplier. They may have warranty support, subscription support or consultancy and various levels of payment. We're free and are trying to help and we all learn together as we help & explore.
Robin