I have this same problem, just bought a brand new Dell Inspiron 2 in 1 and brand new out of the package the touchpad is not working correctly. I'll be doing the two-finger scroll and randomly it will stop working. I have to click into another tab, scroll, and then go back to the other tab to get it to continue scrolling. I have been searching around the community here for answers and it seems this is an ongoing problem for Dell laptops for the last couple of years (or at least since Windows 8 was around), maybe even longer. Gee, you would think a company as big as dell would fix its problems since it's been a persisting problem for a while now but i guess not. 

I know you didn't post your question looking for other people to just say, "having the same problem" but hopefully if there are enough replies on it, someone from the support team will be more likely to see it and post an updated driver solution. I've tried to follow the ones on older posts but the settings and control panel stuff isn't the same as it used to be. Hopefully, Dell will get on this and solve this problem which is obviously their fault as my new out of the box laptop does it but I doubt it. 

Thank you for your message. I apologize for the inconvenience caused.

Please run a test on the touchpad from Dell Support Assist application, Click on troubleshooting – check a specific device – mouse (2nd option) & then run the test.

For my reference, please click on the message tab next to your avatar– click “New Message” & search for my Dell username (Dell-Sreejith R) & send a private message with the service tag, registered name & email address.

Click here to find the service tag -  https://dell.to/2xXUCUW

Mine is fixed. I went through all the ridiculous try this, try that rigmarole. It got replaced in the end. I was answering to help k_cauldron out as they have the same issues as I had, in other words their touchpad is also faulty so maybe you could arrange for them to also get a new touchpad. That would be nice, cheers.

Update: Mine is not fixed, it still happens. The screen also freezes up for 5 to 10 seconds at random moments.

Never will I buy from Dell again.

Did you get a chance to run a touchpad test & was the touchpad working fine there?

Is it only the scrolling option that does not work? Does the click work fine?

For my reference, please click on the message tab next to your avatar– click “New Message” & search for my Dell username (Sreejith R) & send a private message with the service tag, registered name & email address.

How to find service tag.

mine also has the same problem. usually this kind of problem is connected to the driver. however, dell is entirely useless when it comes to drivers for the touchpad, because they are not available for download under the xps section for my model 9370. dell offers some touchpad drivers for other xps models, but they are enclosed within an installer. the installer checks your laptop model and refuses to install if its own check fails.

as far as I know touchpads for the xps are synaptics. so the other option would be to get drivers from synaptics. they however do not offer any for download on their website.

the whole thing is absurd because normally drivers should be available for download, and it's very unprofessional for dell to not offer any. they leave the touchpad in the hands of windows, which takes care of precision touchpads. however, if there's some incompatibility for certain dell laptops, windows isn't going to do anything about it. so if you check the driver's version on the xps 9370 it says the drivers are from 2006.

I've tried different suggested solutions but I could not find any that worked. finally I found some recent synaptics drivers on a 3rd party website and forced their installation on the xps. I have not finished testing so I'm not sure it will work. the drivers and touchpad work, but I am waiting to see if the issue is resolved or not