MFP H625cdw - Printer sometimes won't accept TCP/IP

Howdy. Sometimes, typically after sleep, I am unable to send jobs using the IP protocol over WiFi. When this happens, the printer's browser interface inaccessible. The printer doesn't respond to ping / ICMP packets. Restarting the printer temporarily resolves the issue. I've also found that performing a document scan to an FTP server on my LAN works during one of these outages. After the scan, the printer is again accessible via TCP/IP. The printer firmware is 201802280649. I've reproduced the connectivity problem from OS X and Windows 7 & 10. When these outages occur, no other problems are notable on the LAN. WiFi signal is listed as 'good' in the Print Server Setup Page of the browser interface. Wired Ethernet and USB are not options in my scenario. Thanks!