Service desk plus 7.6.0 crashing only in "inventory"?

Service desk plus 7.6.0 crashing only in "inventory"?

well, i have manage engine service desk plus 7.6.0 installed in an old server but it was fine until yesterday i couldn't browse correctly the application and i had to restart the service just to move from one section to another.After few hours it crashed completely with the message from apache tomcat:
No ManagedConnection available within configured blocking timeout.
 
i rebooted the server it went well but i have always the same probleme with only one page what is "inventory"(if i click on it it keep browsing even for an hour for nothing) and as i told if i need to browse it, add a new workstation or even scan a new pc i need to reboot the service.
it's making me waste time and i really need to get my work done.
and as i see now even the other pages are bugging.
thanks alot for all who wil help me.

                  New to ADSelfService Plus?