Is it sketchy that my boyfriend only talks to me on the phone while he is in his car?

He doesn't call me when he is at home like he used to. He used to call sometimes before bed at home. Now he only has a phone convo while he is driving or parked. We only see each other on weekends. It became a practice for us because we both get tired throughout the week. One time I asked if I could come over on a weekday and he texted "I'm laying in bed baby. Give me a heads up next time." Is this common?
Is it sketchy that my boyfriend only talks to me on the phone while he is in his car?
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