[Q] Wifi IPv4 Address unavailable - Android Q&A, Help & Troubleshooting

as what the title says, my IPv4 is unavailable when i connect to wifi network.
but i can connect to the internet via mobile data.
BUT, when i restart my phone with wifi turned on and a wifi network which it can connect, IPv4 will be detected, but my mobile data will suffer because all of my APN's will disappear, but when i restart my phone w/ Wifi off, APN's will be restored.
Help guys, im frustrated about this problem of mine.
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*my phone is Cherry Mobile Cosmos X
a quad core MT6589

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