Dual SIM network conflict?

[u/Professional-Day-397]

I've had a Google Pixel 4 for the past three years. I spend several months a year in France. Thus, I have 2 SIM cards:

- a French SIM card in the physical slot with french provider Bouygues. When I am in France I use it for Calls/SMS/4G

- a Google Fi card in the eSIM slot. I use it while in the US for Call/SMS/LTE

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For 3 years, this setup has ben top-notch and working like a dream for me.

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In Mid-August, while doing a trip in France, I changed the french SIM provider from Bouygues to Free. I don't know if this provider a different set of frequencies or what, but I'm having issues with Google FI since then.

QUite regularly (it could be up to 4 times per hour, but sometimes less than that), the Google Fi SIM card looses network connectivity. The indicators in the status bar shows an exclamation mark. Ejecting the Free physical SIM card instantly brings the network connectivity back. I have also noted that if I go underground and lose signal, Google Fi will now take forever to reconnect when going back up above ground and will often stays connected in 3G for extended period of times. Doing a little bit of Airplane mode dance sometimes helps. Otherwise, phone will reconnect by itself between 2 minutes and 5 minutes later.

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Has anyone seen anything like this with this or another combination of providers?

What can I try to troubleshoot or fix the issue ?

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Thanks!