It's possible. Your WAG160N is an older unit, with most likely out of date / flawed firmware. Not saying newer stuff will be any better, but it should be.
You also mention your current router / modem has been acting up. If it's not something that can be easily fixed with a configuration change, firmware update etc... now would be a good time to upgrade to a current model with better / faster networking..
The specs on your machine show that it is draft 802.11n, not final, your wired ethernet connection types aren't specified, which would tell me that they are most likely fast ethernet (10/100) instead of Gigabit...
If you can afford to upgrade, this is a good opportunity to do so...
First things first, unless you absolutely have to have a combo unit, you are typically better off having your modem and router as 2 separate devices. The integrated units seem to have a reputation for slower performance, and higher failure rates. Probably due to the added heat of the additional circuits in the same space...
Whatever setup you go with, try to get something running at least Wireless N600 or better, with gigabit wired ports...
Don't get me wrong. I totally understand the appeal of combination devices. Fewer things to connect, less total space consumed / I.E. less clutter. I totally get it, but consider the advantage of going with a more modular approach. With a modem and router separate, you don't have to replace an entire combo unit to get the next upgraded features you may want such as faster wireless N such as simultaneous dual band, or gigabit wired ports.... and the modem itself, if you have trouble with that, you only have to replace the modem and you are up and going again, instead of having to reconfigure your network all over again...