Some possible workarounds are:
First try using cifs:// instead of smb:// to connect to the server volumes.
If that doesn't help, then there is a way to change all connections that use SMB1 by entering this command in Terminal:
echo "[default]" >> ~/Library/Preferences/nsmb.conf; echo "smb_neg=smb1_only" >> ~/Library/Preferences/nsmb.conf
rm ~/Library/Preferences/nsmb.conf
[crarko adds: I don't have a way to test this at the moment, but I do recall reading that people have experienced some of these issues. If someone has a NAS device to test this with (especially if there have been problems) please let us know if either of these fixes helped.]