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Why Wireless file sharing to network share is very unstable

Recently, while backing up my files to the NAS, over wifi, I have noticed it’s is very much unstable and unreliable. The file duplication (copy) stopes or brakes, even tried with Teracopy as windows explorer has a habit of becoming unresponsive. Yet no luck.

I have noticed many a time that is with network driver crashing or windows having some internal issue with no logs in resources monitor.

However, to eliminate the chances of a wifi provider (wireless AP/ router) malfunction,
tried packet checking with internet connection, no errors.
When connected through wired connection everything works great. It only on the wifi (Signal levels are above 90%).

The network shares are SMB(linux instance). 1.0 disabled. And Remote Differential Compression API is enabled.

It is to be noted that this happens whenever file size is bigger, doesn’t matter much if that’s multiple smaller ones or solid data chunks. But experienced
Mostly over 20GB.

Did not try 5GHz as the signal decay is too much.

In this context, does windows file replication has any kind of checksum varification involved?