A72 Touch screen problem

[userb3CrNhubio]

Good morning to everyone.

I have the A72, yesterday suddenly the touch does not work, the mobile has not hit anywhere. The screen opens and closes from the buttons, I reboot it from the power + down button of the audio and it works again. If I shake the phone the screen seems to turn off the touch. So I can not answer the phones at least.
I need to have it on the table to work properly.
I asked at a store in the neighbourhood but they immediately told me to change the screen.Has anyone encountered a similar problem in samsung's A series?

[NoctisCaelum]

If rebooting the phone makes your screen works try to go to Settings > General management > Reset > Reset Accessibility > Reset > Reset. You should get a message the Accessibility is reset. Let me know if this helps

[userb3CrNhubio]

Thanks for the response,
I did what you said but the situation did not change. The device turns on normally, the screen works, but when I move it (for ex. from the table to my bag or office), the screen does not respond to touch. 
There are times when it can work for an hour but then the same thing happens again.
Could it be the cable that connects the mainboard to the monitor as they call it Main Flex Cable?
Could it be fixed with a factory reset?

[Samsung_Moderator · Accepted solution]

Hello, thank you for your feedback. I understand your concerns and I will be more than happy to assist you with this situation. There are some simple ways to get the touchscreen working again when it’s frozen, unresponsive, or acting funny. Here are some troubleshooting steps to assist you with getting the phone working correctly http://www.samsung.com/us/support/troubleshooting/TSG01213974/. 

Additionally, a factory reset may help resolve any software concerns. 

If the issue persists after performing the troubleshooting steps, you can use the following link to find a list of service centers in the U.S. that can do the repair: http://www.samsung.com/us/support/service/location or by contacting customer support at 1-800-726-7864.

For service outside the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html