#1
Each day I take my guitar out of the case and tune it straight away. The G always goes out of tune straight away and goes out of tune periodically for a few minutes, but after about 5-10 minutes, it stays in tune. Why is this? It's an Epi LP Standard.
Epiphone Les Paul Standard
Fender MIM Standard Strat
Fender Deluxe Reverb
Digitech Bad Monkey
Electro Harmonix Big Muff
Ernie Ball VP Junior 250k
Dunlop Cry Baby Wah
#3
Nope.
Epiphone Les Paul Standard
Fender MIM Standard Strat
Fender Deluxe Reverb
Digitech Bad Monkey
Electro Harmonix Big Muff
Ernie Ball VP Junior 250k
Dunlop Cry Baby Wah
#4
It's your guitar adjusting to the room temperature probably, leave the guitar out for a bit before tuning it.
#5
that happens with lots of guitars, they just have stock tuners im guessn don't worry it happens to mine to, the g-string always goes out of tune every couple of minutes until it sets in and then it stays like that for as long as i play unless i do some huge bends or something because it's an old(ish) guitar that's been beaten up a bit, like there's a crack in the headstock which rattles weirdly when im in drop d
'08 Gretsch White Falcon
'98 Fender USA Deluxe Tele
'79 Greco Les Paul Standard
Airline Stratotone Crafter GAE8

A bunch of funky pedals

Handwired 50 Watt Plexi Lead Clone w/ Orange 4x12
#6
also the temperature thing that JackalUK said
'08 Gretsch White Falcon
'98 Fender USA Deluxe Tele
'79 Greco Les Paul Standard
Airline Stratotone Crafter GAE8

A bunch of funky pedals

Handwired 50 Watt Plexi Lead Clone w/ Orange 4x12
#7
Temperature changes make a difference, two degrees affects tuning .

Also, if your string is sharp, always drop it below and bring it back up to proper pitch, to take the slack out of the gears and the section between nut and tuner. If you just drop it to the proper pitch it leaves slack in the gears and behind the nut, soon as you start playing you pull that slack out and it's out of tune again in no time. This happens with good or cheap tuners, it makes no difference, it's the tuning method not the tuners. The cheapest tuners you can find will stay in tune just fine if you always bring the strings up to pitch and leave no slack anywhere. Otherwise I coulden't play my 1966 Harmony onstage, cheap open back tuners with exposed gears, some of the cheapest tuners around. But it stays in tune really well.

Other things can cause intermittent problems, but usually just occasionally on a flaky string. The wraps in front of the ball end can start working loose, string pegs on acoustics can work loose or be installed improperly, the wraps on the tuners can be loose or improperly done, and loose tuners can cause trouble. If a string is binding in the nut it can easily work out of tune.
Hmmm...I wonder what this button does...
#8
On a low-end 3l/3r headstock, I find that rarely are there stock tuners that do the job. Though, it's too early to judge based on just the tuners. Leave your guitar out, change the string, tune it up. If the string is still acting funny, it's more than likely your tuner. Lube up the nut slots with pencil graphite, too. That always helps incase it's getting bound up. Same for your saddles on the bridge. If the saddle grooves aren't smooth, strings can bind or even break.
Sincerely, Chad.
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