They told me to try the RLC-511W so, in fact, I think they don't have any idea and also they don't care about it...
I've told support that I can ask amazon to accept the return all the cameras I have, even the good ones and move to other brand...
What they answered?... we are working in the new firmware...

It was two months ago... then, radio silence...

A lot of time since my post, last Monday I ordered a RLC-410W from Amazon and the “DHCP” to “Static” wifi problem is still there, saddly no response from the technical department, neither here or by mail.

Hello Carl, maybe you didn't read the first post in full, I've already contacted support (request #117259) and as you can read there the 354 firmware do not correct the problem, in fact Reolink RMA refunded the camera cost to me but I didn't return it, according to their instructions, because of the shipping cost.
The cameras I do returned was the ones I bought from Amazon because all had the same behavior, and we are not talking about one camera but four, two RLC-410W (Version IPC_51316M) and two RLC-422W (Version IPC_51516M5M).
Because of that I assume is obviously not a defective item.

Sorry about my English.

Nobody can experience this behavior?
Nobody from Reolink?

(Carl) This is a copy/paste of the mail already sent to support after the new firmware was released, feedback?, camera refunded.

(Crimp On) The parameters for the static IP are correct and working perfectly all across my LAN and also work perfect in three RLC-410WS and a RLC-422W of the previous series connected from more than a year.
The problem existed in the firmware that come in the new cameras from factory and is still there in the last version.

I decide to post this here to check if somebody experienced this problem I'm have with, at least two camera models.

I found Wifi problems with two brand new cameras (wifi connection lost after reset or power cycle the camera), contacted support and they instructed me to update both systems firmware.

After updating the firmware here is my complete feedback.

Step 1: Update the firmware and test the already configured camera.
Result: Wifi connection lost, the fault remains the same.

Step 2: Reset it to the factory state, load a previously saved configuration file and reset the camera.
Result: Wifi connection lost, the fault remains the same.

Step 3: Reset to the factory state, configure each parameter like the other cameras in the network, step by step and then reset the camera.
Result: Wifi connection lost, the fault remains the same.

Step 4: Reset to factory status and test it as is, remove power from camera and wait to start up.
Result: The fault disappears, so I figured out that something is wrong with one of my special configurations.

Step 5 (final one): Reset to the factory state, configure each parameter like the other cameras in the network but removing the power from the camera after changing each parameter.
Result: The fault does not appear until I change the connection type from "DHCP" to "Static" and surprise!, wifi connection Is lost until you connect it to the LAN by wire, does not matter if when it is connected with the cable you set again connection as "DHCP", the problem does not disappear until camera is reseted to the factory state.

Conclusion: With the last firmware update wifi connection is working unless you modify the network connection type, once you touch it you have to reset to factory state to use normally with wireless network.

Both cameras, the RLC-410W (Version IPC_51316M actualized to 354_19031112 firmware) and the RLC-422W (Version IPC_51516M5M actualized to 354_19031106 firmware), experienced the same behavior, They are not defective items I’ve checked with two brand new cameras on the first days of April and the problem is there yet.