Win10 file explorer eternal green bar share not connecting

Sometimes it's like my Freenas 11.3 U1 goes to sleep and needs time to wake up, although I do not spin down disks. Shares mapped to a drive letter in win10 always respond, but my more seldom used shares don't show up at first try when clicking the Network icon in file explorer. I get the green bar searching for an eternity and then failing. But if I then close file explorer and try again I get instant connection.

Is this a quirk of samba/netbios (I see people saying the network icon has...

Win10 file explorer eternal green bar share not connecting