I'm using a Valkey ElastiCache with StackExchange.Redis on .NET. It's usually working but sometimes I'll get this message:

The message timed out in the backlog attempting to send because no connection became available (5000ms) - 
Last Connection Exception: SocketClosed on <myelasticacheendpoint>/Interactive, 
Idle/MarkProcessed, last: INFO, origin: ReadFromPipe, outstanding: 0, last-read: 0s ago, last-write: 12s ago, keep-alive: 60s, 
state: ConnectedEstablished, mgr: 8 of 10 available, in: 0, last-heartbeat: 0s ago, last-mbeat: 0s ago, global: 0s ago, v: 2.8.31.52602, 
command=GET, timeout: 5000, inst: 0, qu: 1, qs: 0, aw: False, bw: SpinningDown, last-in: 0, cur-in: 0, sync-ops: 22, async-ops: 0, 
serverEndpoint: <myelasticacheendpoint>, conn-sec: n/a, aoc: 1, mc: 1/1/0, mgr: 10 of 10 available, 
clientName: 94abce17895e(SE.Redis-v2.8.31.52602), 
IOCP: (Busy=0,Free=1000,Min=1,Max=1000), 
WORKER: (Busy=1,Free=32766,Min=4,Max=32767), 
POOL: (Threads=5,QueuedItems=0,CompletedItems=1357296,Timers=106), 
v: 2.8.31.52602 
(Please take a look at this article for some common client-side issues that can cause timeouts: .Redis/Timeouts

As you can see my busy threads are all under the min. The qs is 0. The state is ConnectedEstablished. What could be causing this issue?

The ElastiCache is in two regions, so I fetch the cache configuration details using DescribeServerlessCachesAsync, use _databaseConnection = ConnectionMultiplexer.Connect(configurationOptions); to connect, _databaseConnection.GetDatabase(0) to get the database, and then _databaseConnection.StringGet(myKey) to get my value