Phone slower after upgrade to V81

[avayax]

An issue I found on all of my T23G phones after upgrading to V81 (44.81.0.20).
The phone is reacting slower when pressing digits.
E.g. when the phone is idle and I press digits to dial a number, it takes a few seconds for the phone to react, for the dialed digits to appear on the phone and hearing the beep tone of each.
On V80 this wasn't the case.
Looks like V81 is slowing down my phones.
Sometimes there are also no beeps when pressing digits.

[Lucia_Yealink]

HI Avayax，

About the slwoer issue, please share us more info below:
1. how much seconds the phone need to react?
2. did the phone connect the headset?
3. how long the phone was used? Does reboot the phone solve the issue?
4. Please upgrade the phone to the latest firmware and reset the phone to factory by long press the OK key, then do test again.

Latest firmware: http://download.support.yealink.com/down...1.0.25.zip
And help us to collect the files below:
a. level 6 syslog
b. config.bin
c. pace trace

About how to collect the info, please refer the FAQ below:
http://support.yealink.com/faq/faqInfo?id=313

5.Besides, please kindly tell me the probability:
How many phones you have in total? And how many of them have the issue?
How often did the slower issue happen？

For the beeps when pressing digits, you can configure the parameter below via auto provision to enable or disable it:
features.key_tone =
#1-enabled, 0-disabled.

Thank you for your info in advanced.