Unfortunately, no. SmartThings does not provide network mapping tools at the present time.
If you give us the brand and model numbers of your devices, we can tell you whether they’re zwave or zigbee. They also should have the appropriate logo on the device, but sometimes it’s inside the battery compartment and it’s a pain to check all of them.
As far as siting the hub, yes, get it into an open space, preferably at least 4 feet off the ground, and at least 10 feet from your Wi-Fi router. That will maximize the signal availability. 
Here’s the standard checklist for when a sensor gets “stuck” but to be honest for the last couple of months most of the problems seem to have been cloud problems, especially if multiple devices are involved . It can’t hurt to run through the checklist though: