One of our IBM Customers are using RHEL V8.9 are noticing on all their Queue Managers(they have both uniform cluster and RDQM) randomly end and restart itself. When the message hit the MQ server at the exactly same time as QM restarts, all message during that time frame are getting failed.

Upon talking to Redhat Support Team they commented that . Red Hat does not provide issues coming from DRBD packages and from the IBM support side we are clueless.

If this is the case, what would be the recommended software to install to support the RDQM functionality without any abrupt QM restarts. Any comments or direction would be helpful. 

RDQM and depend modules (e.g. DRBD) is supported by IBM MQ support. If needed IBM MQ support will discuss with the DRBD vendor.  In an RDQM environment, if the network is not stable or if the system is running short CPU or if the node is a VM and frozen, then the QM might be restarted.  I suggest opening ticket with IBM MQ support.