Instable WiFi connection on MBP 13''

My Macbook Pro 13 (mid 2012) loses WiFi connection from time to time, while a PC7 an iPhone and an Android phone work just fine. The router is Dlink DIR-300. Supports 802.11n.
Maybe the problem is that some of my other devices make the router switch to another format or protocol which is incompatible with the MBP's WiFi module?

This could be for quite a few reasons, if you are in an area where there are a lot of wi-fi networks then changing the channel may make the difference. You can download iStumbler and see what networks are in your area and what channel they're on. If you see several with the same channel as yours that could be the problem.
Another common issue is the ISP you are using has issues with it's DNS settings. That is also a very simple fix by following these instructions:
1. System preferences
2. Network
3. Click Advanced
4. Click DNS tab
5. Click + sign
6. Add 208.67.222.222
7. Click + sign
8. Add 208.67.220.220
9. Click OK.
10. Exit System Preferences
11. Try out your iMac and report what happened.
Regards,
Roger

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