Laptop key stuck

I'm trying to fix a key on a Toshiba 2105CDS laptop. When Windows starts, W key is stuck. When I press any key, problem clears. The W key sticks and clears the same way when working in Microsoft Word.

I lifted up keyboard and blew compressed air under and around W key, but no luck.

Does anyone know if the key is physically stuck or this is some electrical problem, since pressing any key clears the problem?

 

Try turning it upside down & gently bouncing it on the keys . Use a flat surface . Then turn it on it's edge & & gently bang it on the flat surface . Repeat on all edges & then repeat the bouncing on the keys .

It usually dislodges a lot of junk .