Can you please check if you have tried the below steps:
Clear cache for Samsung Wallet: Go to Settings > Apps > Samsung Wallet > Storage > Clear cache. (Avoid clearing data unless you're okay with re-setting the app.)
Check battery and background settings: Make sure Wallet isn't being restricted: Settings > Apps > Samsung Wallet > Battery > Unrestricted. Also check Settings > Battery > Background usage limits, and ensure Wallet isn’t listed under sleeping or restricted apps.
If it still disables itself after all this, we recommend submitting feedback through the Samsung Members app so the dev team can take a closer look.
Thanks for confirming you've already tried all the common troubleshooting steps regarding the Samsung Wallet Default Quick Access Card issue.
We recommend submitting an error report with system logs through the Samsung Members app: Samsung Members > Support > Error reports > Samsung Wallet > Describe the issue.
This helps Samsung’s developers trace the root cause and prioritize a fix in future updates. Appreciate your patience while the team works on this.
