When I have my FP5 plugged in charging, the touch screen doesn’t work properly. Lot of presses are missed/not registered by the system. Not an issue as soon as I plug it out. Been like this since I got it. I just have to make sure I charge it at time when I don’t plan to use it, so not a huge problem, but it really shouldn’t be like this.
Have you tried different cable and charger? If yes, would contact support contactsupport
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Make sure you are using a cable for charging and data.
And because it was not explicitly mentioned here yet: This is definitely not normal. I can use my phone without any limitations while charging. I’m using the charger that was offered for FP1 and 2 many years ago, so no quick charge, either, but I have switched to eco charging in the settings anyway which should be slow charging in any case. The cable is indeed a data cable. With this cable I connected the phone to a Dell docking station and to my bicycle dynamo powered charger, too, and I never had any issues so far.
This can also be due to weird electricity in your mains. Definitely try if it happens also while charging from a powerbank, or from a grounded laptop (i.e. connected to charger using a 3-pin 220V cable).
Thanks for the replies. I actually went to test it with a number of charger and cable (with data) combinations last night, and couldn’t replicate it. Seems like it does not happen every time, but often enough to notice it.
Had the phone plugged in over night, and when I woke up this morning, it was an issue again, so not sure if it happens after a certain amount of time, or when the battery is of a certain percentage.
It’s happened in two different houses now, so not a mains issue I reckon.
With the cable you normally use or a different one?
I would start using a differnet cable and/or charger for some time, whennit does not always happen, so go step by step
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this has happened to me in the past with the FP4, as well. Now I’m just not using it while charging
I have seen this at least once, (particularly difficulties in scrolling) but as you say, the effect is not reproducible at will.
I wouldn’t be surprised if this was caused by localized EMF effects, as peci1 says, possibly increased by low relative atmospheric humidity we’ve been experiencing in my area recently.
Welcome to bumpsy 
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