D-Link DSL-2750B: admin unstable and impractical

Purchased disaster to replace a Netgear who took a thunderbolt, I took the first broadband router came in the store (not purchased from Amazon).
The administration interface is poorly designed and slow despite a wired Ethernet access connection. With the mode "Advanced", you can not turn it on, I had to take the basic installation by default. And some parameter changes in recovering other default if we are not careful (eg when creating a second network for Internet access only, the name of the first is reset).

When at last we manage to make it work, it really cash wi-fi and wired Ethernet traffic. Compared to my old Netgear, he saves 700 kb / s on my ADSL connection to about 13 Mb / s. This is the highlight.
But it is unstable. 3 or 4 times a week, I:
- A loss of wi-fi, it is then necessary to deactivate and reactivate from the administration interface
- A total crash, even the administration is no longer accessible. The electrical shutdown is necessary.

I have owned a D-Link router there ten years, reliable and with a graphical and user friendly interface. Compared to that D-Link today produced with the DSL-2750B, there's no picture is plummeting, it happened in the very low end. Acceptable in a pinch for simple installation and whose config LAN and wi-fi does not need to be altered frequently.