hi,
I bought Logitech K360 wireless keyboard, it worked fine untill past week.
The key combination to select text,
SHIFT+LEFT_ARROW
CTRL+SHIFT+LEFT_ARROW

desktop switching
CTRL+ALT+LEFT_ARROW

window moving to dekstio
CTRL+SHIFT+ALT+LEFT_ARROW

non of combination including left arrow key works.
Actually they work sometimes and most of the time it does not.
I could not find any pattern in key pressing. One thing to mention is, If i press left-arrow for 2 seconds(if i am on the text the cursor starts moving). then then try key combinations, they work.

Please help.