Here's a quote from my bug report to Valheim devs: "Hello everyone, I want to first say that I may have found a temporary solution to an issue plaguing the souls of a lot of Valheim vikings... I recently discovered a "fix" for anyone that has "ZRPC Timeout" Disconnection issues.
If you used DnSpy, you may already be away of the data limitations Valheim has, and may have already changed the data. This method is very very similar.
First: Download dnSpy Second: Open dnSpy Third: Go to File>Open>Find your Valheim installation directory> select valheim.exe
Fourth: notice the long list of the library of code Valheim uses> click the arrow to the left of the name "assembly_valheim"
Fifth: Click the arrow to the left of "{ }" Sixth: scroll down to "ZRpc", and click the arrow Seventh: scroll down to "m_timeout", and Right Click> Edit Class> "private static float m_timeout = 30f;" is the DEFAULT. Here lies the ISSUE. Some PCs are having trouble connecting within "30" seconds. Change the "30f" to something bigger (i.e. 300f)
Your Welcome!"

I really hope this helps everyone else. I did NOT test this for dedicated servers. You may have to do the same thing for your Valheim Dedicated Server, as this was just a clientsided fix