m15, second exchange unit, more issues: WiFi, display, overheating

As you can tell by the topic, I'm so exhausted, because this is the second exchange m15 unit I received from dell and I see that each and every three m15's that I have had by now had some issues right out of the box. OK, to put it in a nuts shell, here are my main issues with this second exchange unit:

1- WiFi speed does not go upper than 30Mbps download and 20Mbps upload, in spite of the fact that I have high speed internet from Rogers. My iPhone X's, Apple TV, and even my old m15 that I have to send back to dell speed tests show at least on average 170Mbps download and 30Mbps upload.

2- Display is calibrated so badly that whites show yellow. It's actually like having a very thin but noticeable yellow film layer on the screen. Is there a way I can change this calibration?

3- Overheating! yes this has existed in all three m15's that I have had so far. Not even one unit have had good cooling solution. I don't want to open my new machine to repaste. I have started a thread about my first m15 overheating, but received no good help.

Thanks,