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Have just got mobile wifi and it worked with my lap top .but when i disconnected from it and returned to my normal wifi connection my lap top would not connect to anything e-mail or internet
If this was my situation I would try a soft reboot by turning it off and on and or turbo g your laptops Wi-Fi connection Off and On in an attempt to refresh the connection.
Another option would be to 'Forget the connection' in your laptop and reset up the Wi-Fi connection settings.
Connecting to both Wi-Fi sources shouldn't affect the laptop as it has and sounds like a glitch.
It's only the same as connection to home Wi-Fi and then visiting a coffee shop and connecting to theirs.
Current Phone >
Samsung Z Fold³ 5G.
Previous Phone >
Samsung Note 20 Ultra 5G - SM9860.