after one ui 5 laggy
Sorry to hear that, about your experience with the recent updates on your Samsung Galaxy A51 having a lag issue and we apologize for the inconvenience it caused you.
Before you try out the recommendations below, be sure to check if your device's software and related apps are updated to the latest version. To update your mobile device's software, follow these steps:
Step 1. Go to Settings > Software update.
Step 2. Tap on Download and install.
Step 3. Follow the on-screen instructions.
Step 4. Reset your device.
Also, you can submit an error report through Samsung Members app as follows:
Step 1. Long press Samsung Members icon on Apps screen and tap Error reports.
Step 2. Tap OK on agreement popup to send system log data.
Step 3. Select Symptom category "Slow device".
Step 4. Describe the problem in details and SEND.
How to submit an error report on Samsung Members app? | Samsung PH
For more assistance, you may contact us on our online Samsung support channels below.
Or contact our Samsung direct hotline numbers below.
#GALAXY or #425299 [Mobile Phones & Tablets]
1-800-10-7267864 [All Product, Toll Free, PLDT]
1-800-8-7267864 [All Product, Toll Free, Globe]
842 221 11 [All Product, Landline]
Daily (8:00am to 8:00pm)
I suggest to backup all your files and consider a factory reset to refresh your phone. It will be a fresh restart.