Exchange system log spammed with schannel errors

After configuring a Hybrid Exchange environment, the system log of my onpremise Exchange server is constantly spammed (upto 10 errors every second) with schannel errors saying "A fatal alert was received from the remote endpoint. The TLS protocol defined fatal alert code is 46." The errors are generated by lsass.exe. We also noted an increased CPU load caused by lsass.exe.

- System
  - Provider
   [ Name]  Schannel
   [ Guid]  {1F678132-5938-4686-9FDC-C8FF68F15C85}
   EventID 36887
   Version 0
   Level 2
   Task 0
   Opcode 0
   Keywords 0x8000000000000000
  - TimeCreated
   [ SystemTime]  2018-01-23T10:06:02.273160300Z
   EventRecordID 105008218
   Correlation
  - Execution
   [ ProcessID]  564
   [ ThreadID]  10744
   Channel System
   Computer MAIL1.mydomain.local
  - Security
   [ UserID]  S-1-5-18
- EventData
  AlertDesc 46

The difficulty is that our Exchange server is joined to a local domain, serves local and public mail addresses, and we currently only have a wildcard certificate for a public domain, which is used for SMTP and IIS services by Exchange.
Quick research in the internet says that the issue might be caused by the mail server trying to use this certificate for LDAPS, generating errors because the server FQDN is in a local domain.
Would be very gratefull if someone points me a way to make it working without purchasing a SAN certificate and disabling scannel logging (if there is such way)
Alex ManakovAsked:
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ajohnson30Network ManagerCommented:
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Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: ajohnson30 (https:#a42445401)

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