Canon EOS 250D Advanced User's Manual page 472

Operations such as shooting and playback are not possible.
With a Wi-Fi connection established, operations such as shooting and
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playback may not be possible. Terminate the Wi-Fi connection, then
perform the operation.
Cannot reconnect to a smartphone.
Even with a combination of the same camera and smartphone, if you
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have changed the settings or selected a different setting, reconnection
may not be established even after selecting the same SSID. In this
case, delete the camera connection settings from the Wi-Fi settings on
the smartphone and set up a connection again.
A connection may not be established if Camera Connect is running
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when you reconfigure connection settings. In this case, quit Camera
Connect for a moment and then restart it.
Operation Problems
A camera button or dial does not work as expected.
Under [5: Custom Functions(C.Fn)], check the [Assign SET button]
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setting (= 452).
For movie shooting, check the [5: Shutter btn function for movies]
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setting (= 254).
During touch screen operations, the beeper suddenly sounds
softer.
Check if your finger is blocking the speaker (= 28).
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Touch operation is not possible.
Check if [5: Touch control] is set to [Standard] or [Sensitive]
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(= 65).
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