My blokada app will always restart

I download form blokada websites, latest version 5, device is poco m3 global, device rom is miui global 12. 0.6, Android 10 QKQ1. 200830.002

I already set up close battery optimized, vpn always on. But sometimes it will suddenly close tha apps need open again, even connect wifi or phone internet also same will like that…

Than got another problem is, i got connect to dns blokada, i feel internet gt some slow… If no connect to dns will faster a bit