I also experienced this when typing fast and multi-touch was sometimes unresponsive when charging. Does the fast charge ability affect the multi-touch?
Hello everyone, since i announced ghat the new ota update fix the multitouche issue on A70, it really fix it forever, i used to play pubg more than handred times, and seems that the problem was gone forever, so for the people who are waiting the ota update, just wait you turn on the samsung's ota list, samsung will offer it soon for worldwide users, for those one who claims waiting for the update you can go to sammobile and download the new os version for ukraine, and test the multitouch fix on it and after that comeback to the original RDIO VERSION and wait for the ota, so people don't be pressed the fix will achieve all users of GALAXY A70. Good luck.
I was having the same problem with my phone as well. I couldn't play PUBG or any other app which uses mutlitouch. Today I got an system update which promises that it will fix the touch screen issue. I hope it fixes all the touchscreen problems.