The most likely scenario is that moisture got into your phone. The touch circuitry is pretty much all in the screen so if there are any ghost touching issues, a replacement screen should be sufficient. However, if a known-good replacement screen still has the same issue, then the problem is probably at the logic board level. You could check the connector on the logic board to see if there is any visible corrosion but beyond that, logic board issues require a visit to your friendly neighbourhood micro-solderer.
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=== Update (09/14/2018) ===
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@refectio What do you think i should do then as the guy in the shop took my screen off and then said it wasn’t the screen then he put it back on and now the phone is stuck in a boot loop and restoring the phone doesnt resolve this.
The most likely scenario is that moisture got into your phone. The touch circuitry is pretty much all in the screen so if there are any ghost touching issues, a replacement screen should be sufficient. However, if a known-good replacement screen still has the same issue, then the problem is probably at the logic board level. You could check the connector on the logic board to see if there is any visible corrosion but beyond that, logic board issues require a visit to your friendly neighbourhood micro-solderer.