Tech support

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Hey wsr, i work in personal tech support. meaning i mostly help old people with their computer in private. pays really well and am able to fix 9/10problems but the past week ive gone back to the same house 3 times.
they have an old dell laptop with a dualcore pentium inside. almost completely clean factory settings only a couple pics so no weird shit but it says it ahs no internet or weak with teh orange triangle and yellow !. i looked at teh router it seems old but fine nothing weird just alot of lights and ugly zyxel model. i hooked it up by cable worked , took it off internet work perfectly for a day then the next day they say its back and worse , each time i come back do it like this and it works again 5bars n all. wtf is wrong? the router or the laptop?