A friend finds that she has problems with her keyboard (I don't know if it's wireless or not): capitals, spaces, punctuation, individual letters can be missed out and have to be re-keyed. Caps sometimes require more than one attempt to key in, with much extra key pressure required. Apologies for the lack of hard info re make of equipment - she's gone away and I'd be v grateful for any suggestions re what might be wrong and how to put things right! By the way, it's a new PC.
Whatever, keyboards are notorious for the garbage that falls in between the keys. Try turnin the key-board upside down and shaking it. You can afford to be quite strong with a desktop, but be far more gentle with a laptop.