Smartthings Classic App not working: fixed with reboot

Woke up this morning. All my Lifx bulbs were on. Reached for my phone to see what’s going on and the Class app would not show me any devices.
Went to dashboard to check events under monitoring but once again, can’t due to ‘connection’ issue.
Online, found others had faced same issue which they resolved by rebooting their phones.
Rebooted mine and issue fixed.
I’m using a Samsung s10+.
Noticed others also using Samsung mobiles who faced the same. Also, never faced this issue with my Sony Xperia.
Anyhow, anyone facing the same, fix appears to be rebooting your mobile. I hope my post helps somebody…