I have had my other team program on ev3 for 4 years and they never had
issues. Yes the robot does depend on sensors and the calibration etc varies
from lighting to lighting but we never had ev3 mis-behave. Probably since
you are changing the batteries the wires were switched around. Or possibly
if you change the distance between wheels the turns can be different. But
restarting the ev3 usually solves most of the problem. Also charging the
battery is critical as it doesnt perform the same with a low charge
compared to a full charge.

Hopefully you have your issues resolved before the tournament. Good Luck

Amit !!

On Mon, Nov 4, 2019, 7:32 AM Manisha Marwah <[log in to unmask]>
wrote:

> We had similar issue yesterday. Touranment is in a week and many missions
> working normally no longer worked.
>
> Thanks
> Manisha
>
> On Mon, Nov 4, 2019, 7:07 AM Shilpa Kapadia <[log in to unmask]> wrote:
>
>> I think EV3 brick is very bad we had similar problem I wish FLL change
>> something else instead of EV3. I call the LEGO people and did not get any
>> solution.
>>
>>
>> Sent from my iPhone
>>
>> On Nov 3, 2019, at 11:32 PM, masahide okada <
>> [log in to unmask]> wrote:
>>
>> Hi!
>> Thanks for the advice! Is it possible for as single program in a project
>> (on the computer) to have a bug? We tried deleting the one program on the
>> computer that the robot was not following properly, and rewrote it in
>> exactly the same way. This seems to have solved the problem though we
>> haven’t tested it enough to know for sure. Unfortunately, even if it did
>> work, we don’t know what caused it, so we are unsure how to prevent it from
>> happening again. Any thoughts?
>> Thanks,
>> Rosanna
>>
>> Sent from my iPhone
>>
>> On Nov 3, 2019, at 5:10 PM, srinivasalu s <[log in to unmask]> wrote:
>>
>> 
>> Try deleting all programs and download it once again.
>> On Sun, Nov 3, 2019, 4:00 PM masahide okada <
>> [log in to unmask]> wrote:
>>
>>> Hi all,
>>>
>>> Our tournament is November 10 and our EV3 brick has just started going
>>> crazy on us. It followed programs beautifully yesterday afternoon, we
>>> turned it off, plugged it in to charge it, and then turned it on again an
>>> hour or two later to show someone the new programs. This is when the robot
>>> started acting strangely, for example, going backwards when the program
>>> (that it followed before) says to go forward.
>>>
>>> The team has tried charging the battery overnight, checking for software
>>> updates (none), updated the firmware, unplugging and replugging in all the
>>> cables, restarting the app on the computer (a Dell). We even tried a new
>>> brick. Same problem.
>>>
>>> Can anyone offer any guidance? I’m desperate as our tournament is in 6
>>> days.
>>>
>>> Thanks,
>>> Rosanna Okada
>>> Lego my Eggo
>>> Sent from my iPhone
>>>
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