I'm a firm believer in using static IP addresses for ALL computers which are connected via a network, be it wired or wireless.
If you are worried about losing track of which IP addresses are assigned to particular computers, make a list and keep it close to (or under) the router.
Use "ping" from a command prompt to see whether particular computers can see and be seen by the router in use.
Make sure that anti-virus and anti-spyware/malware programs are not blocking network access. (This can sometimes occur when such programs are updated (or update themselves)).
Check to make sure that firewalls are not blocking access.
If in doubt, turn ALL such programs, including Windows Firewall and Windows Defender off.
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