Hi there, I2fanM,
After reading your post, our understanding is that you are having trouble with keeping your iPhone 12 Pro Max communicating over a Wi-Fi network, though other devices do not have a similar issue. You've come to the right place for help!
The Apple Support articles If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support is designed to help troubleshoot issues connecting with, and transmitting data over, Wi-Fi networks. We suggest ensuring you have followed all the steps in that article first.
Once you have confirmed all steps in the above article have been completed, we also suggest checking out the recommendations offered in Recommended settings for Wi-Fi routers and access points - Apple Support for additional assistance.
Additionally, some Wi-Fi networks may limit the number of devices that can connect at one time. Once that limit is reached, new devices attempting to join the network may have trouble getting, or staying, connected, and/or may have trouble sending and receiving data once they are connected. It looks like you have several other devices also using the Wi-Fi network, so we would recommend the following steps to help determine if this may be the issue:
- Disconnect all devices from the network. This not only includes your other iOS devices and computers, but also any gaming consoles/devices, smart appliances (like TVs, refrigerators, washer/dryers, etc), wearable technology (like an Apple Watch or FitBit).
Then,
- Connect only your iPhone 12 Pro Max to the network and test to see how it performs.
If the iPhone 12 Pro Max works without issue while no other devices are connected, it is likely a capacity issue. To resolve and manage this, make sure you disconnect devices from the network when not in use.
Best!
