Active Calls Dropped and SDL Link out of service

Hello,
I have a UCCE 9.0 and UCM 9.1
For 4 days in a row we are facing the following problem:
- Active agent calls are dropped
- Agents have to login again to CTIOS server
- I dumped the jgw process logs on both PGs: I found a "CallManager_Failure" error
- On UCM RTMT tool, I can see the following error at the same time of the issue: SDLLinkOutOfService
Note: The issue is happening daily at the same time
Anyone knows what could be the issue?
Thank you,
Sahar Hanna

SDL links are used between CCM, CTI, and CMI services to share data regarding the current status of devices and to send calls to and from different nodes in the cluster. They form a full mesh between like and dislike services. I.E. CCM on node 1 will have an SDL link to CCM on node 2 and to CTI on node 1 and 2 and so on.
SDL links going out of service usually represent a network outage between the nodes or a service crash on one of the nodes. Any core files in RTMT?
If the alert isnâ€™t continually re-firing, then the link is probably operational again.

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