: Ensure no foreign objects, dust, or grease are on the screen surface, as these can interfere with resistive touch accuracy. Use a Stylus

The cost of a replacement touch panel (digitizer) for a popular model like the TPC7062Ti is around $30–$50 USD, and replacement is straightforward (un-screw old, plug in new, re-calibrate).

Once the "TSLIB calibration utility" or a similar prompt appears, follow these steps: How do I calibrate an HMI touchscreen? - Maple Systems

MCGS HMIs are robust, but resistive touch screens are mechanical devices that wear. If calibration solves the issue for only a week, order a replacement touch panel (usually $20-$40). If calibration fixes it immediately, you just saved a service call.