gdb remote debugging fails strangely

Question

I am debugging a x86-64 device using Eclipse with gdb.

It was working fine till yesterday, when I cleaned my project and built it again. Now, I face a strange problem. It starts, and hits my first breakpoint. Then, I click Resume and it may run till my next breakpoint or give a remote failure reply e7295 error.

On the console I see these annoying lines:

Ignoring packet error, continuing...
warning: unrecognized item "timeout" in "qSupported" response

My gdb commands are as follows:

set architecture i386:x64-32 
set remotebaud 115200
target remote COM1
set disassembly-flavor intel

I restarted Eclipse and my laptop, I closed all unnecessary internal windows of Eclipse (memory browser, disassembly etc.), changed my serial cable, debugged the device with the same cable and project on my colleague's laptop.

What may be hindering gdb from debugging?