StackRedis.L1 | .NET in-Memory L1 '' cache for StackExchange.Redis | Caching library

I have a Redis Database on a Centos server, and 3 Windows servers are connected to it with approximately 1,000 reads/writes per second, all of which are on the same local LAN, so the ping time is less than one millisecond. The problem is at least 5 percent of reading operations are going timeout, while I read maximum 3KB data in a read operation with 'syncTimeout=15', which is much more than network latency.

I installed Redis on bash on my windows 10, and simulate the problem. I also stopped writing operations. However, the problem still exists with 0.5 percent timeouts, while there is no network latency. I also used a Centos Server in my LAN to simulate the problem, in this case, I need at 100 milliseconds for 'syncTimeout' to be sure the amount of timeout is less than 1 percent. I considered using some Dictionaries to cache data from Redis, so there is no need to request per item, and I can take advantage of the pipeline. But I came across StackRedis.L1 which is developed as an L1 cache for Redis, and it is not confident in updating the L1 cache.

This is my code to simulate the problem: