Advice please? No internet after a day

[ViciousClone]

So this is for a buddy of mine,

He's got a mikrotik router, zyxel switch and trendnet plain switch.

So they've got voip and WISP, Wisp goes to the Router, the rest go into the zyxel, then a cable runs to the room next door to the small trendnet switch for internet, the pc's run from this trendnet.

Issue is every day ( internet stays on for a day) it throws out the internet on the pc's but the phones work?

So then everything needs to be restarted over and over again until they come back on?

Is my issue the switches?

Any more info you guys need please ask.

 

[ViciousClone]

So the Zyxel is 192.168.1.1
Tp link not trendnet( Sorry ) is 192.168.0.1

When removing the tp link everything works again. So re routed all the cables to the zyxel

 

[irBosOtter]

Why is the TP link switch on a different network than the Zyxel?

 

[EasyUp Web Hosting]

Why is the TP link switch on a different network than the Zyxel?

If he is doing a bad setup using Class B network (255.255.0.0), it shouldn't matter.

Is the TP-Link manageable? Or what do you mean by the TP-Link is 192.168.0.1?
What is the IP for the Mikrotik?