There is no technical limit specified, but some relays stop events at 65536 bytes which is TOO LOW. NIP-44 encryption also. I think 1MB is a better limit. I can't remember how many tags makes it go over 64K but it was around 1000.
Discussion
I only had about 5 or so, but they're gone from my follow list.
This is a known issue it has happened to many of us due to client failures.
You're the man! Much appreciated.