Intermittent speedometer

The speedometer is analog. It can cut out for seconds but less than a minute.
The brake, traction warning lights also come on intermittently.
A few days after this started the battery drained. Battery is ten months old. I had a 1996 with the same issues.
Could be BCM. But is it just as likely a ground problem?
My left speaker cuts out intermittently. Open driver door and speaker works. So, speaker problem could be a broken wire.