No it shouldn't be affected by any other device, your phone/ipad don't control infrared devices,
so that means that you've got a bad mainboard in the tv.
Even on a 2 month old set that type of failure wouldn’t be surprising for this brand. These are some of the lowest quality tvs on the market. They are built to meet a certain price point, not for quality or reliability. It is completely normal and expected to see them last just a year or so at best.
There is one step you can take here, both as a possible fix, as well as a diagnostic evaluation:
1) Unplug the power cord from the outlet
2) Wait at least 1 hour (60+ Minutes)
3) Press and hold the power button (on the set, not the remote) for 60 seconds
4) Keep holding power button while plugging back in, and for another 60 seconds after. When plugging back in, go directly to the wall outlet, bypassing any power strips or surge protectors.
If this reset process does not work, it would unfortunately confirm an internal hardware failure.
This is something that would require repairs to correct; the only good news there is that it should be covered under their warranty. Their warranty process and support is difficult to deal with, but it should be covered at their expense. If they won't cover it for some reason, it is simply not worth fixing. You'd be better off buying a new tv from a more reputable brand than putting more money into this one.