Phone switches to speaker mode

Phone: Pixel 3a
Plan: My Choice (Annual)
Included: Talk & Text (no Data)

My phone occasionally switches from normal mode to speaker with no warning. It can be at the start of a call I make or receive or during a call. Easy to switch it off, but I’m wondering if there is some way to keep it from happening. I first noticed it about a month ago.

You may want to follow this Help Article and Clear Cache … with intermittent problems, often time a ‘bit’ can get set by an app or the system itself, which when the exact same conditions occur a problem will re-occur
If possible we should clear both system and application app

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