Send Governor hanging issue on multiserver environment

HI Experts,

We really don't know how to overcome this send governor issue, in two days servers bounced 6 times to fix the send governor hanging isue.

we are on BPC 7 MS, SP5, Multiserver environment(Two appservers and one database server)we have been using the prod system for 6 months without any issues, recently we extended the logic to execute for more periods,then started facing the issue of one of the appserver goes down automatically (most of the times appserver02) while users send data using input shchedules and sometimes we see the locks in lckapp table, during this time users can't loginto the system untill restart the com+ services ,send governor service and teboot of servers.

we are able to clear out the locked members from lckapp tables and users are able to resend it.

why does appserver go down automatically ? what should be the reason ? How to fix this kind of issue?

any help should be appreciated greatly!

Thanks

Krishna