@Umar11b Am also having this issue, but with wired devices as well. Ping is steady at 40-60ms even standing right next to it but spikes to 200-600ms every 2-5 seconds. Have fiddles with multiple...

So I've had this modem for 2 days now. Day one speeds and latency were fantastic, and the range was finally extended into our back bedroom which had previously been resigned to an absolute dead zone....