TP link keeps dropping connection

Why have you two routers connected to the same network?
1. TL-MR3020 Portable Wireless N Router
2. Three ZTE MF730M dongle (router).
The problem is the router does not know which route to choose, so remove one of them and it should stop dropping out.

Go into the router web interface and turn on DHCP. This will provide the IP address and routing information to your computer's network card,

try reset your router , and look at the status of lamps , then tell me that

Do Resetting by pressing small button from back and then configure your computer Ethernet Adapter to Obtain IP auto. Try reconnecting it.

TP-Link Router not working, want to setup TP-Link router, have troubleshooting issues. No need to worry we are here to provide you the best solution according to your requirements of router issue. You just need to dial TP-Link Router Helpline Number avail at toll-free number 1-833-284-3444. Our tech support team includes executives who are professional and know each & every solution which may arise at the time of accessing.
The wireless network is unstable via my wireless router/modem router
Some time router is not still connected and working that time users do follow given instruction and make the trouble-free router.
Locate wireless clients in a reasonable distance.
Get away from obstacles.
Reduce the number of wireless clients.
Decline interference from other wireless equipment.
Optimize the router's position.
Change some settings on the router.
Test the WIFI device.

Get technical service for your problem which is not understanding how to solve the technical issue, our technical expertise is available for 24*7 and they are ready for pick up the call when called by the customer. If wants to more technical service visit our TP-Link Router Service websites.

https://servicenumber.org/tp-link-router-customer-service.html

check channel , try to change channel to 6,11 . check the long way between your device and router . if not soluted , try another pc to check disconnection , if disconnected the problem with your wireless router , if not the problem with your wireless device

DO any of these error conditions show up on the front panel display?

Front-Panel Lights and Error Conditions
Light Turns Off During Startup If:
RECEIVE The downstream receive channel cannot be acquired
SEND The upstream send channel cannot be acquired
ONLINE IP registration is unsuccessful
POWER The SBG900 is not properly plugged into the
power outlet
OR
Light Turns Off During Normal Operation If:
RECEIVE The downstream channel is lost
SEND The upstream channel is lost
ONLINE IP registration is lost
POWER The SBG900 is unplugged

If you rent or lease your SBG900 Contact your cable service provider.
If you own your SBG900 Call 1-877-466-8646 for technical and warranty support. Support is available
24 hours a day, seven days a week.

Hi,
The defaults are:
username: admin
password: admin

To reset, hold the reset button for 10 seconds without powering off.

Here's the website, just for future reference:
http://www.tp-link.com/support/download.asp?a=1&m=TL-R402M

Hope this helps

Chris (ziraffa)