how you solve it?

I mainly use hotlink, but recently I constantly switch sim card in a single smartphone. (both sim card is active)(hotlink/Digi)

Last week, when I tried to swap back to hotlink my phone can't detect the sim card. So I thought it might be the sim card has broke for some reason. Then I go to nearest maxis outlet and did a replacement and work. after around 3 day I swap back to Digi and swap back to hotlink the sim card become undetected.