Touchpad stops working

The touchpad on my acer laptop isn’t working properly.
I’ve already done a lot… changed the grub with the “10…reset”-thing, installed xserver-xorg-synaptics, …

Now, I do get it to work for a few moments after entering the following lines in the terminals but it stops as well…

sudo rmmod i2c_hid
sudo modprobe i2c_hid

Those are the only signs of life I could get out of my touchpad.