[BrendaAnnD]

Do you perhaps use one of those room to room internet expanders that plug into the wall? There are a LOT of things that can cause that on HF bands, including what is called BPL (Broadband over Power Line), which is in sporadic use these days, and is a known destroyer of HF reception. Hams have been fighting it for years. Another possibility is a switch mode wall wart or DSL modem (cable modems are offenders too, but less so.) Last but certainly not least, plasma displays radiate more hash than a fry cook.