No problem. I've started having those too!
And if you obtain a recording in a format that your TV does not understand and want to convert it to MP3 which the TV does accept, save it at the highest bitrate that Audacity offers. I'd go for about 200 kbit/sec as a minimum. This is because MP3 is a "lossy" format, so the more you compress, the more information you discard and therefore the greater the compression artefacts.
File sizes (for a stereo recording) are about 620 MB/hour for uncompressed WAV format (equivalent to what's on a CD) or roughly 110 MB/hour for 256 kb/sec MP3.