MMO Side mouse key button press delays

Product: Apex Legends
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number GTX 1080
Enter RAM memory size in GB 32GB
What is your gamertag/PSN ID/EA Account name? Ahrier
Please provide your squad mates' gamertag/PSN ID/EA Account name if possible.
Are you using any software with an overlay? No
Which Legend were you playing (if applicable)?
Which Legends were your squad mates using (if applicable)?
Where did the issue occur? In a match
Which part of the map or menu were you in? If you don't remember the exact name, please describe the area or what you were trying to do in the menu. All the map, sometimes starts happening about 10 mins into the game only some times instant.
What were you doing when the issue occurred? E.g. respawning a squad mate at a beacon, using an ability, a squad mate left the game. Changing weapons/ selecting shield's/heals.
Did your squad mates also experience the issue? No
How many matches had you played in a row before the issue occurred? Happens on first
When did this happen? (dd.mm.yy hh:mm) 23:09:20
How often does the bug occur? Often (50% - 99%)
How severe is your issue? Major impacts to gameplay
What happens when the bug occurs? Having a very strange delay/lag between pressing the side buttons on an MMO mouse in game? This only started happening the past few weeks in Apex on the recent and hasn't been happening in other games or out of game. I use the corsair scimitar mouse and haven't had this issue at all until recently. Even just clicking the 1+2 numbers on the side of the mouse which should be equal to 1+2 on the keyboard to change weapon is lagging.
What should be happening instead? No delay and instant key presses.
Steps: How can we find the bug ourselves? Not sure if its just me, but would be the same type of mouse maybe.

‌

Is anyone else having a very strange delay/lag between pressing the side buttons on an MMO mouse in game recently? This only started happening the past few weeks in Apex and hasn't been happening in other games or out of game. I use the corsair scimitar and haven't had this issue at all until recently.