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Some other diagnostics occurred to me overnight.
1) Can the failing device ping itself? If not then something is very strange with the device and/or with the router.
2) Can the failing device ping any other device on your network, including the router? If it can't ping anything or if it can ping only the router then probably the router is enforcing isolation.
3) The inverse is also worth checking. Can any other device ping the failing device? You might see a pattern based on how the two devices are connected to the network. For example, two on the same wifi band can see each other but one on cable and one on wifi cannot.
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