'MS sql server memory pressure occurs in logs

We have SQL Server 2016 running on Windows 2016 datacenter edition with 64 GB ram (for SQL we have allocated 59 GB).

For the past month we have checked in logs following error like appdomain unloaded due to memory pressure.

Logs:

1.Date 5/24/2022 3:36:02 PM Log SQL Server (Current - 5/24/2022 11:10:00 AM)

Source spid2893

Message Unsafe assembly 'crystal.license.sql.service, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil' loaded into appdomain 182666 (Petrus_WalletHR.dbo[runtime].184090). 2. Date 5/24/2022 3:36:02 PM Log SQL Server (Current - 5/24/2022 11:10:00 AM)

Source spid2893

Message AppDomain 182666 (Petrus_WalletHR.dbo[runtime].184090) created. 3.Date 5/24/2022 3:36:02 PM Log SQL Server (Current - 5/24/2022 11:10:00 AM)

Source spid32s

Message AppDomain 182664 (Nexus_WalletHR.dbo[runtime].184088) unloaded. 4.Date 5/24/2022 3:36:02 PM Log SQL Server (Current - 5/24/2022 11:10:00 AM)

Source spid21s

Message AppDomain 182664 (Nexus_WalletHR.dbo[runtime].184088) is marked for unload due to memory pressure.

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