Their dismal run has seen them go down 2-1 to Bournemouth, 3-1 to Swansea, 1-0 to Tottenham and 2-1 to Brighton in addition to their defeat at St James' Park. But he has struggled for form throughout the campaign and he has made several costly mistakes of late.
Yes, speculation about the futures of Rafa Benitez and Newcastle's key players.
Pierre-Emerick Aubameyang ran onto a long ball into the Newcastle area and picked out Lacazette, who stretched to volley home at the far post for his 13th goal of a hard first season following his move from Lyon.
The home side didn't panic and continued, with a visible belief, to search for a goal, or goals, of their own.
It was a goal that highlighted Shkodran Mustafi's growing defensive frailties - first allowing Dwight Gayle to run at him, and then completely losing track of goalscorer Perez.More news: After TRS, MIM supports JD's to defeat communal forces?
Wenger will leave Arsenal in a better position than when he took them on over two decades ago (even if that scale has dipped massively in the past decade), but his devotion to self-reservation means that they are in danger of losing their status at Europe's top table.
The second half was a much tighter affair but it was the Magpies who got the victor in the 68th minute when Matt Ricthie calmly slotted home from close range to seal all three points for Rafael Benítez's men.
Arsenal continued to look laboured in the second half, and were made to pay for their lethargy shortly after the hour mark when Matt Ritchie fired home from inside the box following good work from Perez.
The other eight times had produced six defeat and two draws (Liverpool and Swansea) but this time it was a famous victory, showing great character to regroup and come back to deservedly win.
Substitutes not used: Darrow, Clark, Hayden, Manquillo.
Arsenal: Cech; Chambers (Maitland-Niles, min. 78), Mustafi, Holding, Monreal; Elneny, Xhaka, Willock (Welbeck, min. 68); Iwobi (Nketiah, min. 86), Aubameyang, Lacazette.