TX relay problem

Dr M T Thomas VU3NWB

I am new to bitx. My microbitx is just completed. RX is fine with very good reception. 
TX is working with a trouble. 
If push the PTT the current used is increasing slightly. During modulating the  current reached to above 2A. But the display showing 'select band'  and eventhough the PTT is released the TX is continuosly on and never return the relay to RX. To return the RX the only way to power off the radio and restart.
Kindly advise me how to rectify this. 
VU3NWB Thomas.

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