Logitech M535 Bluetooth Mouse Black

This mouse suffers very badly from interference with other bluetooth and wifi devices, which renders it completely unusable. If you plan to use this mouse around other bluetooth devices (e.g. headset, speaker, ...) and/or wifi signals that you cannot change to 5Ghz channels, then expect to get seriously laggy behavior from this mouse! Also, the online Logitech customer chat help service was a very bad experience. I had missed the return window from the seller, so I contacted Logitech customer service. They were unable to help, and also unwilling to exchange the product for a non-bluetooth mouse. Astonishingly, the agent just deliberately cut off the conversation (see transcript of the chat below - the chat was cut off after the agent's last message)! I have used many Logitech products and was generally satisfied. But after this experience, I will think twice about buying from Logitech again!! Chat transcript: Melvin B (2/22/2018, 10:07:09 AM): Hello! Thank you for reaching out to Logitech Support. Someone will be with you in a moment. Me (2/22/2018, 10:07:38 AM): Thank you Melvin B (2/22/2018, 10:08:50 AM): thank you also for waiting Melvin B (2/22/2018, 10:08:55 AM): how can i assist you for today? Me (2/22/2018, 10:09:29 AM): I have recently bought a mouse by logitech, model M535. it's connecting to the computer by bluetooth Me (2/22/2018, 10:10:04 AM): unfortunately it is very laggy, i.e. it makes weird jumps and has delays when moving the pointer across the screen Me (2/22/2018, 10:10:23 AM): this happens when either another bluetooth device is nearby, or when using the wifi of the computer Melvin B (2/22/2018, 10:10:25 AM): are there other bluetooth devices around or wireless devices that may interfere the signal Me (2/22/2018, 10:10:46 AM): this has not happened with my previous bluetooth mouse Me (2/22/2018, 10:11:09 AM): so I was hoping you have a fix for this. nothing has changed except that I changed the mouse to one by logitech Me (2/22/2018, 10:12:37 AM): is there a way to get the mouse to choose a different transmission channel? it is unfortunately completely unusable otherwise every time I use the computer's wifi Melvin B (2/22/2018, 10:14:56 AM): one moment please Melvin B (2/22/2018, 10:15:04 AM): are there other bluetooth devices around or wireless devices that may interfere the signal? Me (2/22/2018, 10:16:38 AM): as I just mentioned, yes, there is my computer's wifi, and a bluetooth headset. when either of them is on, the lagging immediately starts. obviously I need my computer's wifi, so I cannot just turn off that to solve the problem. Melvin B (2/22/2018, 10:18:02 AM): understood Melvin B (2/22/2018, 10:18:46 AM): can you please try to turn off the headset then check if the issue will persist Me (2/22/2018, 10:19:15 AM): yes it persists Me (2/22/2018, 10:19:29 AM): it only stops when neither the wifi nor the headset is on Melvin B (2/22/2018, 10:22:09 AM): ok Melvin B (2/22/2018, 10:24:32 AM): basically at this point we cannot do something about the interference since this is the setup of your computer Me (2/22/2018, 10:27:00 AM): ok, that is really unfortunate. the mouse from a different manufacturer did not have this issue, despite everything else being the same setup (same headset, same computer). so this mouse goes to trash ... thanks for your help anyways Melvin B (2/22/2018, 10:28:04 AM): we understand sir and you are always welcome Me (2/22/2018, 10:29:48 AM): as this product is obviously unusable for its purpose, and my return window for the selling shop has already closed, is there a way to get this exchanged for a different model that might not have this issue? Melvin B (2/22/2018, 10:34:00 AM): let me see what i can do at this point Melvin B (2/22/2018, 10:34:16 AM): i am not promising anything at this point ok sir? Me (2/22/2018, 10:34:24 AM): I understand, thank you Melvin B (2/22/2018, 10:38:38 AM): still checking sir Me (2/22/2018, 10:39:15 AM): thanks for your help Melvin B (2/22/2018, 10:44:14 AM): unfortunately as we have checked we cannot send a replacement for another device because the issue might still be the same Me (2/22/2018, 10:45:17 AM): even for a different model? I had non-bluetooth mice from logitech before, using regular wifi. these never had such interference problems Melvin B (2/22/2018, 10:47:10 AM): one moment please Melvin B (2/22/2018, 10:52:18 AM): im truly sorry sir because when our next level of support evaluated the case this can still happen