Tough I made connections as you said. My bolt device is getting heated up very fast, as soon as I supply power using a USB cable.
this happened when I was trying to my 1ST project light intensity monitoring.
The Bolt WiFi module has a voltage regulator and an ESP8266 chip on them, which often tend to get heated up.
This is normal for the chip for a certain temperature range, which most people feel is excessive.
Do not worry if the module heats up too much.
If however the Module stops working as it should, please send an email to firstname.lastname@example.org.
Your device may still be in the warrenty period and Inventrom will send a replacement for the same if it is not working as it should.