cursor jumps while typing, mouse pad does not click reliably

Hello, I have a 2017 Razer Pro portable. Many times, as I am typing, the cursor jumps back to a prior position or randomly. The mouse pad does not reliably click. The problem is less when it is cool, in the first 30 minutes after turning on, doing just web surfing. The problem will even inturrupt streaming movies while streaming, with no interaction from me. I have: * wiped down the mouse pad with rubbing alcohol * scanned repeatedly for virus' with Norton, surface and deep scans, not finding anything * reinstalled Windows OS, wiping out many things. I am ready to buy another computer. If this isn't fixed, I won't buy Razer again. This is my 2nd.