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Usually that happens because GPIO 0 isn't connected to GND while flashing.
ESP8266 GMail sender
Replaced the power supply as someone suggested and strange enough that resolved the mobile browser problems. Thanks to all that PMed with ideas.
Hey this worked great out of the box with one caveat. From either of the PCs I tested it with it works fine, but none of my mobile browsers can turn the LED on/off. The web page displays, but once I click the button to turn the LED on, it will display "The connection has timed out." and then the NodeMCU will stop responding to desktop requests as well until it's power-cycled. I've tested with 2 phones and a tablet (Android 4.4 and 5.1) as well as 3 different browsers, all to the same effect. Anyone else experience similar problems, or have any ideas?
Modern Stainless Steel Home Numbers DIY