Trackpad started acting jittery

Over the last two days the trackpad on my Librem 15v3 has started acting jittery. Moving the cursor and clicking used to work well. Now the cursor jumps while I move it, make it difficult to target. The trackpad sometimes interprets clicks when I haven’t clicked (it didn’t do this before).

I keep PureOS regularly up-to-date, but I assume this isn’t a software issue. Any suggestions?

$ sudo libinput list-devices
Device:           ETPS/2 Elantech Touchpad
Kernel:           /dev/input/event5
Group:            7
Seat:             seat0, default
Size:             98x67mm
Capabilities:     pointer gesture
Tap-to-click:     disabled
Tap-and-drag:     enabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: disabled
Calibration:      n/a
Scroll methods:   *two-finger edge 
Click methods:    *button-areas clickfinger 
Disable-w-typing: enabled
Accel profiles:   none
Rotation:         n/a
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There was no visible dirt, but I gave the trackpad a thorough wipe with a dry cloth and this resolved the issue.