Any person who will stop being a friend over your lack of WiFi (or lack of internet contact), isn't a friend. Just saying.
For the WiFi issue, try the following...
NOTE: If none of the following work to resolve the problem, and if the phone is under warranty, I would contact the manufacturer.
1. Try and restart the phone. Sometimes it is that simple.
2. Update the firmware and any apps that need updating on the phone.
3. If the problem persists, check your time and date on the phone to make sure it is correct.
4. Should none of the former work...
a. Clear out the WiFi data on the phone.
b. Reboot the modem/router.
c. Once the modem/router is fully 'up' again, reboot the phone and re-input the WiFi data.
5. Check your internet connection. It may be what is going in and out rather than the phone.
6. Make sure you have "Data" turned off on the device when using "WiFi" (that is if you have a plan with data through your phone). If youdn't make sure it is turned off, the device can keep trying to switch to "Data" when you try and use "WiFi".
7. Now, if you are still having the problem at this point, and you are sure it isn't the modem/router that is the problem. Then you may wish to try a "Hard Reset" of the device. However, I really suggest saving this as a last option (or last before parts repair/replacement).
NOTE: Doing this will clear 'all' the data on your phone, so it is suggested you not choose this option unless you have to, or aren't worried about losing anything on the device.
Be sure you back up any data you want to keep, to a computer or cloud account, before doing the reset.
To "Hard Reset" the phone...
1. Make sure that the phone is actually powered off.
2. Press the "Power" and the "Volume Up" buttons, together, until you see the start-up logo on the screen.
3. Once you can see the logo, release the buttons and allow the device to enter the "System Recovery Mode".
4. Next use "Volume Down" button to get to the "wipe data/factory reset" option When in recovery mode the "Volume Up" and "Volume Down" buttons are how to can navigate and highlight what option you need.
5. Once you have selected the "wipe data/factory reset", press the "Power" button to select that option.
6. On the following screen, repeatedly press the "Volume Down" button until the "Yes - delete all user data" option is what is selected.
7. Then press the "Power" button to hard reset the phone.
For the finger movement, running the phone in "Safe Mode" and see if it works well in there. If it does, then it is something on the phone that i causing the problem. Bad app, virus, malware, etc., that needs to be removed. If, however, it won't work correctly even in that mode, then I would look at resetting the device. Just be sure you back up all your personal files and contacts before doing so (to a computer, google account, etc.) so you don't lose things. NOTE: You can't back up apps.
Should none of that work, then you will want to either have a tech look at the device, or as you suggested, get a new one.
To get into "Safe Mode" please do the following.
1. First turn off the phone.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe mode: ON" or something similar.
4. If you wanted disable it, simply repeat the steps above, and you should see "Safe Mode: OFF" rather than on.
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